42990945 has 16 divisors (see below), whose sum is σ = 68893440. Its totient is φ = 22892544.

The previous prime is 42990917. The next prime is 42990949. The reversal of 42990945 is 54909924.

It is not a de Polignac number, because 42990945 - 2⁷ = 42990817 is a prime.

It is a super-3 number, since 3×42990945³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42990897 and 42990906.

It is not an unprimeable number, because it can be changed into a prime (42990949) 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, 9672 + ... + 13398.

It is an arithmetic number, because the mean of its divisors is an integer number (4305840).

Almost surely, 2^42990945 is an apocalyptic number.

It is an amenable number.

42990945 is a deficient number, since it is larger than the sum of its proper divisors (25902495).

42990945 is a wasteful number, since it uses less digits than its factorization.

42990945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 42990945 is about 6556.7480506727. The cubic root of 42990945 is about 350.3152126306.

The spelling of 42990945 in words is "forty-two million, nine hundred ninety thousand, nine hundred forty-five".