649903838 has 16 divisors (see below), whose sum is σ = 991875456. Its totient is φ = 319327320.

The previous prime is 649903817. The next prime is 649903883. The reversal of 649903838 is 838309946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14945 + ... + 39027.

It is an arithmetic number, because the mean of its divisors is an integer number (61992216).

Almost surely, 2^649903838 is an apocalyptic number.

649903838 is a deficient number, since it is larger than the sum of its proper divisors (341971618).

649903838 is a wasteful number, since it uses less digits than its factorization.

649903838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24319.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 649903838 is about 25493.2116062296. The cubic root of 649903838 is about 866.1963856522.

The spelling of 649903838 in words is "six hundred forty-nine million, nine hundred three thousand, eight hundred thirty-eight".