42087924 has 30 divisors (see below), whose sum is σ = 110026994. Its totient is φ = 14029200.

The previous prime is 42087919. The next prime is 42088003. The reversal of 42087924 is 42978024.

It can be written as a sum of positive squares in only one way, i.e., 39463524 + 2624400 = 6282^2 + 1620^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 64627 + ... + 65274.

Almost surely, 2^42087924 is an apocalyptic number.

It is an amenable number.

42087924 is an abundant number, since it is smaller than the sum of its proper divisors (67939070).

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

42087924 is a wasteful number, since it uses less digits than its factorization.

42087924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129917 (or 129906 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 42087924 is about 6487.5206358053. The cubic root of 42087924 is about 347.8450558740.

It can be divided in two parts, 420879 and 24, that added together give a triangular number (420903 = T₉₁₇).

The spelling of 42087924 in words is "forty-two million, eighty-seven thousand, nine hundred twenty-four".