1397786428 has 24 divisors (see below), whose sum is σ = 2568258000. Its totient is φ = 664718208.

The previous prime is 1397786419. The next prime is 1397786431. The reversal of 1397786428 is 8246877931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82153 + ... + 97696.

It is an arithmetic number, because the mean of its divisors is an integer number (107010750).

Almost surely, 2^1397786428 is an apocalyptic number.

It is an amenable number.

1397786428 is a deficient number, since it is larger than the sum of its proper divisors (1170471572).

1397786428 is a wasteful number, since it uses less digits than its factorization.

1397786428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179949 (or 179947 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 55.

The square root of 1397786428 is about 37386.9820659545. The cubic root of 1397786428 is about 1118.0990361821.

The spelling of 1397786428 in words is "one billion, three hundred ninety-seven million, seven hundred eighty-six thousand, four hundred twenty-eight".