1390253391261 has 96 divisors (see below), whose sum is σ = 2563348732800. Its totient is φ = 740279554560.

The previous prime is 1390253391221. The next prime is 1390253391347. The reversal of 1390253391261 is 1621933520931.

1390253391261 is a `hidden beast` number, since 1 + 3 + 9 + 0 + 2 + 533 + 91 + 26 + 1 = 666.

It is not a de Polignac number, because 1390253391261 - 2¹⁰ = 1390253390237 is a prime.

It is a super-2 number, since 2×1390253391261² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390253391211) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 1080021 + ... + 1986693.

It is an arithmetic number, because the mean of its divisors is an integer number (26701549300).

Almost surely, 2^{1390253391261} is an apocalyptic number.

It is an amenable number.

1390253391261 is a deficient number, since it is larger than the sum of its proper divisors (1173095341539).

1390253391261 is a wasteful number, since it uses less digits than its factorization.

1390253391261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906776 (or 906763 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The spelling of 1390253391261 in words is "one trillion, three hundred ninety billion, two hundred fifty-three million, three hundred ninety-one thousand, two hundred sixty-one".