42656390 has 32 divisors (see below), whose sum is σ = 90780480. Its totient is φ = 14120064.

The previous prime is 42656389. The next prime is 42656399. The reversal of 42656390 is 9365624.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 42656390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42656399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8477 + ... + 12536.

It is an arithmetic number, because the mean of its divisors is an integer number (2836890).

Almost surely, 2^42656390 is an apocalyptic number.

42656390 is an abundant number, since it is smaller than the sum of its proper divisors (48124090).

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

42656390 is a wasteful number, since it uses less digits than its factorization.

42656390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21056.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 42656390 is about 6531.1859566238. The cubic root of 42656390 is about 349.4041289692.

The spelling of 42656390 in words is "forty-two million, six hundred fifty-six thousand, three hundred ninety".