1397578385 has 16 divisors (see below), whose sum is σ = 1918080000. Its totient is φ = 957638976.

The previous prime is 1397578379. The next prime is 1397578387. The reversal of 1397578385 is 5838757931.

It is a happy number.

It is not a de Polignac number, because 1397578385 - 2¹⁶ = 1397512849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1397578385.

It is not an unprimeable number, because it can be changed into a prime (1397578387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36491 + ... + 64239.

It is an arithmetic number, because the mean of its divisors is an integer number (119880000).

Almost surely, 2^1397578385 is an apocalyptic number.

It is an amenable number.

1397578385 is a deficient number, since it is larger than the sum of its proper divisors (520501615).

1397578385 is a wasteful number, since it uses less digits than its factorization.

1397578385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29200.

The product of its digits is 6350400, while the sum is 56.

The square root of 1397578385 is about 37384.1996704490. The cubic root of 1397578385 is about 1118.0435617513.

The spelling of 1397578385 in words is "one billion, three hundred ninety-seven million, five hundred seventy-eight thousand, three hundred eighty-five".