42639910 has 32 divisors (see below), whose sum is σ = 83475360. Its totient is φ = 15616512.

The previous prime is 42639899. The next prime is 42639917. The reversal of 42639910 is 1993624.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42639917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2901 + ... + 9679.

It is an arithmetic number, because the mean of its divisors is an integer number (2608605).

Almost surely, 2^42639910 is an apocalyptic number.

42639910 is a deficient number, since it is larger than the sum of its proper divisors (40835450).

42639910 is a wasteful number, since it uses less digits than its factorization.

42639910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6840.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 42639910 is about 6529.9241955784. The cubic root of 42639910 is about 349.3591265538.

It can be divided in two parts, 426399 and 10, that added together give a square (426409 = 653²).

The spelling of 42639910 in words is "forty-two million, six hundred thirty-nine thousand, nine hundred ten".