42399090 has 24 divisors (see below), whose sum is σ = 110237868. Its totient is φ = 11306400.

The previous prime is 42399083. The next prime is 42399107. The reversal of 42399090 is 9099324.

It can be written as a sum of positive squares in 2 ways, for example, as 41951529 + 447561 = 6477^2 + 669^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235461 + ... + 235640.

Almost surely, 2^42399090 is an apocalyptic number.

42399090 is an abundant number, since it is smaller than the sum of its proper divisors (67838778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42399090 is a wasteful number, since it uses less digits than its factorization.

42399090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471114 (or 471111 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 42399090 is about 6511.4583619954. The cubic root of 42399090 is about 348.7001855855.

The spelling of 42399090 in words is "forty-two million, three hundred ninety-nine thousand, ninety".