1639419428 has 6 divisors (see below), whose sum is σ = 2868984006. Its totient is φ = 819709712.

The previous prime is 1639419413. The next prime is 1639419433. The reversal of 1639419428 is 8249149361.

It can be written as a sum of positive squares in only one way, i.e., 921608164 + 717811264 = 30358^2 + 26792^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204927425 + ... + 204927432.

It is an arithmetic number, because the mean of its divisors is an integer number (478164001).

Almost surely, 2^1639419428 is an apocalyptic number.

It is an amenable number.

1639419428 is a deficient number, since it is larger than the sum of its proper divisors (1229564578).

1639419428 is a wasteful number, since it uses less digits than its factorization.

1639419428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409854861 (or 409854859 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 1639419428 is about 40489.7447262884. The cubic root of 1639419428 is about 1179.1345343961.

The spelling of 1639419428 in words is "one billion, six hundred thirty-nine million, four hundred nineteen thousand, four hundred twenty-eight".