42990405 has 16 divisors (see below), whose sum is σ = 68953920. Its totient is φ = 22871808.

The previous prime is 42990391. The next prime is 42990413. The reversal of 42990405 is 50409924.

It is not a de Polignac number, because 42990405 - 2¹⁴ = 42974021 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3186 + ... + 9804.

It is an arithmetic number, because the mean of its divisors is an integer number (4309620).

Almost surely, 2^42990405 is an apocalyptic number.

It is an amenable number.

42990405 is a deficient number, since it is larger than the sum of its proper divisors (25963515).

42990405 is a wasteful number, since it uses less digits than its factorization.

42990405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 42990405 is about 6556.7068715934. The cubic root of 42990405 is about 350.3137458798.

The spelling of 42990405 in words is "forty-two million, nine hundred ninety thousand, four hundred five".