1639972375 has 32 divisors (see below), whose sum is σ = 2114491392. Its totient is φ = 1269216000.

The previous prime is 1639972343. The next prime is 1639972379. The reversal of 1639972375 is 5732799361.

It is not a de Polignac number, because 1639972375 - 2⁵ = 1639972343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639972379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 481930 + ... + 485320.

It is an arithmetic number, because the mean of its divisors is an integer number (66077856).

Almost surely, 2^1639972375 is an apocalyptic number.

1639972375 is a deficient number, since it is larger than the sum of its proper divisors (474519017).

1639972375 is an equidigital number, since it uses as much as digits as its factorization.

1639972375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532 (or 3522 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 52.

The square root of 1639972375 is about 40496.5723858205. The cubic root of 1639972375 is about 1179.2670865268.

The spelling of 1639972375 in words is "one billion, six hundred thirty-nine million, nine hundred seventy-two thousand, three hundred seventy-five".