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1390 = 25139
BaseRepresentation
bin10101101110
31220111
4111232
521030
610234
74024
oct2556
91814
101390
111054
1297a
1382c
14714
1562a
hex56e

1390 has 8 divisors (see below), whose sum is σ = 2520. Its totient is φ = 552.

The previous prime is 1381. The next prime is 1399. The reversal of 1390 is 931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1381) and next prime (1399).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 8 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 60 + ... + 79.

It is an arithmetic number, because the mean of its divisors is an integer number (315).

1390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1390 is a deficient number, since it is larger than the sum of its proper divisors (1130).

1390 is a wasteful number, since it uses less digits than its factorization.

1390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 1390 is about 37.2827037646. The cubic root of 1390 is about 11.1601902992.

The spelling of 1390 in words is "one thousand, three hundred ninety".

Divisors: 1 2 5 10 139 278 695 1390