1397469638 has 4 divisors (see below), whose sum is σ = 2096204460. Its totient is φ = 698734818.

The previous prime is 1397469629. The next prime is 1397469713. The reversal of 1397469638 is 8369647931.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349367408 + ... + 349367411.

It is an arithmetic number, because the mean of its divisors is an integer number (524051115).

Almost surely, 2^1397469638 is an apocalyptic number.

1397469638 is a deficient number, since it is larger than the sum of its proper divisors (698734822).

1397469638 is an equidigital number, since it uses as much as digits as its factorization.

1397469638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698734821.

The product of its digits is 5878656, while the sum is 56.

The square root of 1397469638 is about 37382.7451907962. The cubic root of 1397469638 is about 1118.0145622957.

The spelling of 1397469638 in words is "one billion, three hundred ninety-seven million, four hundred sixty-nine thousand, six hundred thirty-eight".