1397638489 has 16 divisors (see below), whose sum is σ = 1517967360. Its totient is φ = 1279189440.

The previous prime is 1397638477. The next prime is 1397638507. The reversal of 1397638489 is 9848367931.

It is a cyclic number.

It is not a de Polignac number, because 1397638489 - 2¹⁵ = 1397605721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1397638409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 965164 + ... + 966610.

It is an arithmetic number, because the mean of its divisors is an integer number (94872960).

Almost surely, 2^1397638489 is an apocalyptic number.

It is an amenable number.

1397638489 is a deficient number, since it is larger than the sum of its proper divisors (120328871).

1397638489 is a wasteful number, since it uses less digits than its factorization.

1397638489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its digits is 7838208, while the sum is 58.

The square root of 1397638489 is about 37385.0035308277. The cubic root of 1397638489 is about 1118.0595889804.

The spelling of 1397638489 in words is "one billion, three hundred ninety-seven million, six hundred thirty-eight thousand, four hundred eighty-nine".