1392485731 has 32 divisors (see below), whose sum is σ = 1756028288. Its totient is φ = 1074954240.

The previous prime is 1392485729. The next prime is 1392485753. The reversal of 1392485731 is 1375842931.

It is a 15-Lehmer number, since φ(1392485731) divides (1392485731-1)¹⁵.

It is a cyclic number.

It is not a de Polignac number, because 1392485731 - 2¹ = 1392485729 is a prime.

It is a super-2 number, since 2×1392485731² = 3878033022077208722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1392485701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 643291 + ... + 645451.

It is an arithmetic number, because the mean of its divisors is an integer number (54875884).

Almost surely, 2^1392485731 is an apocalyptic number.

1392485731 is a deficient number, since it is larger than the sum of its proper divisors (363542557).

1392485731 is a wasteful number, since it uses less digits than its factorization.

1392485731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351.

The product of its digits is 181440, while the sum is 43.

The square root of 1392485731 is about 37316.0251232631. The cubic root of 1392485731 is about 1116.6838910934.

The spelling of 1392485731 in words is "one billion, three hundred ninety-two million, four hundred eighty-five thousand, seven hundred thirty-one".