142121540 has 48 divisors (see below), whose sum is σ = 326458944. Its totient is φ = 51542400.

The previous prime is 142121537. The next prime is 142121549. The reversal of 142121540 is 45121241.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (142121549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119750 + ... + 120930.

It is an arithmetic number, because the mean of its divisors is an integer number (6801228).

Almost surely, 2^142121540 is an apocalyptic number.

142121540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142121540 is an abundant number, since it is smaller than the sum of its proper divisors (184337404).

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

142121540 is a wasteful number, since it uses less digits than its factorization.

142121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748 (or 1746 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 142121540 is about 11921.4739021650. The cubic root of 142121540 is about 521.8591488367.

Adding to 142121540 its reverse (45121241), we get a palindrome (187242781).

The spelling of 142121540 in words is "one hundred forty-two million, one hundred twenty-one thousand, five hundred forty".