42490905 has 16 divisors (see below), whose sum is σ = 71985024. Its totient is φ = 21328640.

The previous prime is 42490849. The next prime is 42490907. The reversal of 42490905 is 50909424.

It is not a de Polignac number, because 42490905 - 2²⁰ = 41442329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42490907) 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, 83061 + ... + 83570.

It is an arithmetic number, because the mean of its divisors is an integer number (4499064).

Almost surely, 2^42490905 is an apocalyptic number.

It is an amenable number.

42490905 is a deficient number, since it is larger than the sum of its proper divisors (29494119).

42490905 is a wasteful number, since it uses less digits than its factorization.

42490905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166656.

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

The square root of 42490905 is about 6518.5048132221. The cubic root of 42490905 is about 348.9517069052.

The spelling of 42490905 in words is "forty-two million, four hundred ninety thousand, nine hundred five".