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142440 = 23351187
BaseRepresentation
bin100010110001101000
321020101120
4202301220
514024230
63015240
71132164
oct426150
9236346
10142440
1198021
126a520
134caac
1439ca4
152c310
hex22c68

142440 has 32 divisors (see below), whose sum is σ = 427680. Its totient is φ = 37952.

The previous prime is 142433. The next prime is 142453. The reversal of 142440 is 44241.

142440 = T56 + T57 + ... + T100.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474 + ... + 713.

It is an arithmetic number, because the mean of its divisors is an integer number (13365).

2142440 is an apocalyptic number.

142440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142440 is an abundant number, since it is smaller than the sum of its proper divisors (285240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

142440 is a wasteful number, since it uses less digits than its factorization.

142440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201 (or 1197 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 142440 is about 377.4122414549. The cubic root of 142440 is about 52.2248644774.

Adding to 142440 its reverse (44241), we get a palindrome (186681).

The spelling of 142440 in words is "one hundred forty-two thousand, four hundred forty", and thus it is an iban number.

Divisors: 1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 1187 2374 3561 4748 5935 7122 9496 11870 14244 17805 23740 28488 35610 47480 71220 142440