42639001 has 4 divisors (see below), whose sum is σ = 43275472. Its totient is φ = 42002532.

The previous prime is 42638993. The next prime is 42639041. The reversal of 42639001 is 10093624.

42639001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42639001 - 2³ = 42638993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42639041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 318135 + ... + 318268.

It is an arithmetic number, because the mean of its divisors is an integer number (10818868).

Almost surely, 2^42639001 is an apocalyptic number.

It is an amenable number.

42639001 is a deficient number, since it is larger than the sum of its proper divisors (636471).

42639001 is an equidigital number, since it uses as much as digits as its factorization.

42639001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636470.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 42639001 is about 6529.8545925618. The cubic root of 42639001 is about 349.3566439836.

The spelling of 42639001 in words is "forty-two million, six hundred thirty-nine thousand, one".