1397428911 has 6 divisors (see below), whose sum is σ = 2018508440. Its totient is φ = 931619268.

The previous prime is 1397428889. The next prime is 1397428939. The reversal of 1397428911 is 1198247931.

1397428911 is a `hidden beast` number, since 139 + 7 + 428 + 91 + 1 = 666.

1397428911 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1397428911 - 2⁶ = 1397428847 is a prime.

It is a super-2 number, since 2×1397428911² = 3905615122597291842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397428211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77634931 + ... + 77634948.

Almost surely, 2^1397428911 is an apocalyptic number.

1397428911 is a deficient number, since it is larger than the sum of its proper divisors (621079529).

1397428911 is a wasteful number, since it uses less digits than its factorization.

1397428911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155269885 (or 155269882 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1397428911 is about 37382.2004569019. The cubic root of 1397428911 is about 1118.0037012795.

The spelling of 1397428911 in words is "one billion, three hundred ninety-seven million, four hundred twenty-eight thousand, nine hundred eleven".