1397955285 has 24 divisors (see below), whose sum is σ = 2424569784. Its totient is φ = 745130880.

The previous prime is 1397955277. The next prime is 1397955337. The reversal of 1397955285 is 5825597931.

1397955285 is a `hidden beast` number, since 1 + 3 + 9 + 7 + 9 + 552 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 130096836 + 1267858449 = 11406^2 + 35607^2 .

It is not a de Polignac number, because 1397955285 - 2³ = 1397955277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75399 + ... + 92091.

It is an arithmetic number, because the mean of its divisors is an integer number (101023741).

Almost surely, 2^1397955285 is an apocalyptic number.

1397955285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1397955285 is a deficient number, since it is larger than the sum of its proper divisors (1026614499).

1397955285 is a wasteful number, since it uses less digits than its factorization.

1397955285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18565 (or 18562 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 54.

The square root of 1397955285 is about 37389.2402303122. The cubic root of 1397955285 is about 1118.1440576634.

The spelling of 1397955285 in words is "one billion, three hundred ninety-seven million, nine hundred fifty-five thousand, two hundred eighty-five".