42990881 has 4 divisors (see below), whose sum is σ = 43719600. Its totient is φ = 42262164.

The previous prime is 42990877. The next prime is 42990889. The reversal of 42990881 is 18809924.

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 42990881 - 2² = 42990877 is a prime.

It is a super-2 number, since 2×42990881² = 3696431698312322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42990889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364271 + ... + 364388.

It is an arithmetic number, because the mean of its divisors is an integer number (10929900).

Almost surely, 2^42990881 is an apocalyptic number.

It is an amenable number.

42990881 is a deficient number, since it is larger than the sum of its proper divisors (728719).

42990881 is an equidigital number, since it uses as much as digits as its factorization.

42990881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728718.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 42990881 is about 6556.7431702027. The cubic root of 42990881 is about 350.3150387941.

The spelling of 42990881 in words is "forty-two million, nine hundred ninety thousand, eight hundred eighty-one".