42990105 has 24 divisors (see below), whose sum is σ = 71978688. Its totient is φ = 21869056.

The previous prime is 42990097. The next prime is 42990107. The reversal of 42990105 is 50109924.

It is a happy number.

It is not a de Polignac number, because 42990105 - 2³ = 42990097 is a prime.

It is a super-2 number, since 2×42990105² = 3696298255822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42990107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121609 + ... + 121961.

It is an arithmetic number, because the mean of its divisors is an integer number (2999112).

Almost surely, 2^42990105 is an apocalyptic number.

It is an amenable number.

42990105 is a deficient number, since it is larger than the sum of its proper divisors (28988583).

42990105 is an equidigital number, since it uses as much as digits as its factorization.

42990105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 42990105 is about 6556.6839942154. The cubic root of 42990105 is about 350.3129310129.

The spelling of 42990105 in words is "forty-two million, nine hundred ninety thousand, one hundred five".