42157990 has 16 divisors (see below), whose sum is σ = 86725152. Its totient is φ = 14454144.

The previous prime is 42157987. The next prime is 42157993. The reversal of 42157990 is 9975124.

It is an interprime number because it is at equal distance from previous prime (42157987) and next prime (42157993).

It is a super-2 number, since 2×42157990² = 3554592241680200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42157993) 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, 301059 + ... + 301198.

It is an arithmetic number, because the mean of its divisors is an integer number (5420322).

Almost surely, 2^42157990 is an apocalyptic number.

42157990 is an abundant number, since it is smaller than the sum of its proper divisors (44567162).

42157990 is a wasteful number, since it uses less digits than its factorization.

42157990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602271.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 42157990 is about 6492.9184501270. The cubic root of 42157990 is about 348.0379742328.

The spelling of 42157990 in words is "forty-two million, one hundred fifty-seven thousand, nine hundred ninety".