1397638490 has 16 divisors (see below), whose sum is σ = 2517086880. Its totient is φ = 558758160.

The previous prime is 1397638477. The next prime is 1397638507. The reversal of 1397638490 is 948367931.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16880 + ... + 55499.

It is an arithmetic number, because the mean of its divisors is an integer number (157317930).

Almost surely, 2^1397638490 is an apocalyptic number.

1397638490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1397638490 is a deficient number, since it is larger than the sum of its proper divisors (1119448390).

1397638490 is a wasteful number, since it uses less digits than its factorization.

1397638490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74317.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 1397638490 is about 37385.0035442021. The cubic root of 1397638490 is about 1118.0595892471.

The spelling of 1397638490 in words is "one billion, three hundred ninety-seven million, six hundred thirty-eight thousand, four hundred ninety".