1397574818 has 4 divisors (see below), whose sum is σ = 2096362230. Its totient is φ = 698787408.

The previous prime is 1397574817. The next prime is 1397574839. The reversal of 1397574818 is 8184757931.

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

It can be written as a sum of positive squares in only one way, i.e., 1303426609 + 94148209 = 36103^2 + 9703^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1397574818.

It is not an unprimeable number, because it can be changed into a prime (1397574817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349393703 + ... + 349393706.

Almost surely, 2^1397574818 is an apocalyptic number.

1397574818 is a deficient number, since it is larger than the sum of its proper divisors (698787412).

1397574818 is an equidigital number, since it uses as much as digits as its factorization.

1397574818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698787411.

The product of its digits is 1693440, while the sum is 53.

The square root of 1397574818 is about 37384.1519630979. The cubic root of 1397574818 is about 1118.0426105668.

The spelling of 1397574818 in words is "one billion, three hundred ninety-seven million, five hundred seventy-four thousand, eight hundred eighteen".