907642138 has 24 divisors (see below), whose sum is σ = 1553521788. Its totient is φ = 393994752.

The previous prime is 907642129. The next prime is 907642157. The reversal of 907642138 is 831246709.

It can be written as a sum of positive squares in 6 ways, for example, as 718936969 + 188705169 = 26813^2 + 13737^2 .

It is a super-2 number, since 2×907642138² = 1647628501346422088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 907642138.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 632670 + ... + 634102.

Almost surely, 2^907642138 is an apocalyptic number.

907642138 is a deficient number, since it is larger than the sum of its proper divisors (645879650).

907642138 is a wasteful number, since it uses less digits than its factorization.

907642138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 907642138 is about 30127.0997276538. The cubic root of 907642138 is about 968.2144279713.

The spelling of 907642138 in words is "nine hundred seven million, six hundred forty-two thousand, one hundred thirty-eight".