1397957318 has 4 divisors (see below), whose sum is σ = 2096935980. Its totient is φ = 698978658.

The previous prime is 1397957317. The next prime is 1397957329. The reversal of 1397957318 is 8137597931.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1397957318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397957317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349489328 + ... + 349489331.

It is an arithmetic number, because the mean of its divisors is an integer number (524233995).

Almost surely, 2^1397957318 is an apocalyptic number.

1397957318 is a deficient number, since it is larger than the sum of its proper divisors (698978662).

1397957318 is an equidigital number, since it uses as much as digits as its factorization.

1397957318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698978661.

The product of its digits is 1428840, while the sum is 53.

The square root of 1397957318 is about 37389.2674172683. The cubic root of 1397957318 is about 1118.1445996898.

The spelling of 1397957318 in words is "one billion, three hundred ninety-seven million, nine hundred fifty-seven thousand, three hundred eighteen".