42639633 has 12 divisors (see below), whose sum is σ = 62283780. Its totient is φ = 28106496.

The previous prime is 42639593. The next prime is 42639643. The reversal of 42639633 is 33693624.

It can be written as a sum of positive squares in 2 ways, for example, as 4112784 + 38526849 = 2028^2 + 6207^2 .

It is not a de Polignac number, because 42639633 - 2¹³ = 42631441 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42639643) 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, 25816 + ... + 27417.

It is an arithmetic number, because the mean of its divisors is an integer number (5190315).

Almost surely, 2^42639633 is an apocalyptic number.

It is an amenable number.

42639633 is a deficient number, since it is larger than the sum of its proper divisors (19644147).

42639633 is a wasteful number, since it uses less digits than its factorization.

42639633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53328 (or 53325 counting only the distinct ones).

The product of its digits is 69984, while the sum is 36.

The square root of 42639633 is about 6529.9029854968. The cubic root of 42639633 is about 349.3583700427.

The spelling of 42639633 in words is "forty-two million, six hundred thirty-nine thousand, six hundred thirty-three".