42990731 has 8 divisors (see below), whose sum is σ = 50826720. Its totient is φ = 35578368.

The previous prime is 42990683. The next prime is 42990793. The reversal of 42990731 is 13709924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42990731 - 2⁶ = 42990667 is a prime.

It is a super-2 number, since 2×42990731² = 3696405903828722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42990691 and 42990700.

It is not an unprimeable number, because it can be changed into a prime (42990631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105686 + ... + 106091.

It is an arithmetic number, because the mean of its divisors is an integer number (6353340).

Almost surely, 2^42990731 is an apocalyptic number.

42990731 is a deficient number, since it is larger than the sum of its proper divisors (7835989).

42990731 is a wasteful number, since it uses less digits than its factorization.

42990731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211813.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 42990731 is about 6556.7317315870. The cubic root of 42990731 is about 350.3146313641.

The spelling of 42990731 in words is "forty-two million, nine hundred ninety thousand, seven hundred thirty-one".