42840790 has 16 divisors (see below), whose sum is σ = 77863968. Its totient is φ = 16969536.

The previous prime is 42840781. The next prime is 42840793. The reversal of 42840790 is 9704824.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42840793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19767 + ... + 21826.

It is an arithmetic number, because the mean of its divisors is an integer number (4866498).

Almost surely, 2^42840790 is an apocalyptic number.

42840790 is a deficient number, since it is larger than the sum of its proper divisors (35023178).

42840790 is a wasteful number, since it uses less digits than its factorization.

42840790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41703.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 42840790 is about 6545.2876178209. The cubic root of 42840790 is about 349.9068867952.

The spelling of 42840790 in words is "forty-two million, eight hundred forty thousand, seven hundred ninety".