1397944402 has 8 divisors (see below), whose sum is σ = 2116154700. Its totient is φ = 692559504.

The previous prime is 1397944367. The next prime is 1397944409. The reversal of 1397944402 is 2044497931.

It can be written as a sum of positive squares in 2 ways, for example, as 1393454241 + 4490161 = 37329^2 + 2119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1397944409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3206077 + ... + 3206512.

Almost surely, 2^1397944402 is an apocalyptic number.

1397944402 is a deficient number, since it is larger than the sum of its proper divisors (718210298).

1397944402 is a wasteful number, since it uses less digits than its factorization.

1397944402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412700.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 1397944402 is about 37389.0946935066. The cubic root of 1397944402 is about 1118.1411560939.

The spelling of 1397944402 in words is "one billion, three hundred ninety-seven million, nine hundred forty-four thousand, four hundred two".