637948389 has 16 divisors (see below), whose sum is σ = 964241600. Its totient is φ = 371920896.

The previous prime is 637948379. The next prime is 637948403. The reversal of 637948389 is 983849736.

It is a happy number.

It is not a de Polignac number, because 637948389 - 2⁷ = 637948261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637948369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429724 + ... + 431205.

It is an arithmetic number, because the mean of its divisors is an integer number (60265100).

Almost surely, 2^637948389 is an apocalyptic number.

It is an amenable number.

637948389 is a deficient number, since it is larger than the sum of its proper divisors (326293211).

637948389 is a wasteful number, since it uses less digits than its factorization.

637948389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860964.

The product of its digits is 7838208, while the sum is 57.

The square root of 637948389 is about 25257.6402104393. The cubic root of 637948389 is about 860.8520440578.

The spelling of 637948389 in words is "six hundred thirty-seven million, nine hundred forty-eight thousand, three hundred eighty-nine".