1639382121 has 12 divisors (see below), whose sum is σ = 2550150148. Its totient is φ = 1008850464.

The previous prime is 1639382113. The next prime is 1639382123. The reversal of 1639382121 is 1212839361.

1639382121 is a `hidden beast` number, since 1 + 639 + 3 + 8 + 2 + 12 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1117899225 + 521482896 = 33435^2 + 22836^2 .

It is not a de Polignac number, because 1639382121 - 2³ = 1639382113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1639382123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7005790 + ... + 7006023.

Almost surely, 2^1639382121 is an apocalyptic number.

It is an amenable number.

1639382121 is a deficient number, since it is larger than the sum of its proper divisors (910768027).

1639382121 is a wasteful number, since it uses less digits than its factorization.

1639382121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14011832 (or 14011829 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1639382121 is about 40489.2840267644. The cubic root of 1639382121 is about 1179.1255901107.

The spelling of 1639382121 in words is "one billion, six hundred thirty-nine million, three hundred eighty-two thousand, one hundred twenty-one".