42665590 has 32 divisors (see below), whose sum is σ = 84076704. Its totient is φ = 15459840.

The previous prime is 42665561. The next prime is 42665593. The reversal of 42665590 is 9556624.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42665593) 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, 43182 + ... + 44158.

It is an arithmetic number, because the mean of its divisors is an integer number (2627397).

Almost surely, 2^42665590 is an apocalyptic number.

42665590 is a deficient number, since it is larger than the sum of its proper divisors (41411114).

42665590 is a wasteful number, since it uses less digits than its factorization.

42665590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 42665590 is about 6531.8902317782. The cubic root of 42665590 is about 349.4292466355.

Adding to 42665590 its product of nonzero digits (64800), we get a triangular number (42730390 = T₉₂₄₄).

The spelling of 42665590 in words is "forty-two million, six hundred sixty-five thousand, five hundred ninety".