1397251885 has 4 divisors (see below), whose sum is σ = 1676702268. Its totient is φ = 1117801504.

The previous prime is 1397251859. The next prime is 1397251927. The reversal of 1397251885 is 5881527931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5881527931 = 9619 ⋅611449.

It can be written as a sum of positive squares in 2 ways, for example, as 804913641 + 592338244 = 28371^2 + 24338^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397251885 - 2²³ = 1388863277 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139725184 + ... + 139725193.

It is an arithmetic number, because the mean of its divisors is an integer number (419175567).

Almost surely, 2^1397251885 is an apocalyptic number.

It is an amenable number.

1397251885 is a deficient number, since it is larger than the sum of its proper divisors (279450383).

1397251885 is an equidigital number, since it uses as much as digits as its factorization.

1397251885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279450382.

The product of its digits is 604800, while the sum is 49.

The square root of 1397251885 is about 37379.8325972710. The cubic root of 1397251885 is about 1117.9564897947.

The spelling of 1397251885 in words is "one billion, three hundred ninety-seven million, two hundred fifty-one thousand, eight hundred eighty-five".