1390402555 has 16 divisors (see below), whose sum is σ = 1770543360. Its totient is φ = 1045921888.

The previous prime is 1390402543. The next prime is 1390402567. The reversal of 1390402555 is 5552040931.

It is an interprime number because it is at equal distance from previous prime (1390402543) and next prime (1390402567).

It is a cyclic number.

It is not a de Polignac number, because 1390402555 - 2⁹ = 1390402043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1390402555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95677 + ... + 109246.

It is an arithmetic number, because the mean of its divisors is an integer number (110658960).

Almost surely, 2^1390402555 is an apocalyptic number.

1390402555 is a deficient number, since it is larger than the sum of its proper divisors (380140805).

1390402555 is a wasteful number, since it uses less digits than its factorization.

1390402555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205010.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 1390402555 is about 37288.1020568224. The cubic root of 1390402555 is about 1116.1267555031.

The spelling of 1390402555 in words is "one billion, three hundred ninety million, four hundred two thousand, five hundred fifty-five".