42640992 has 60 divisors (see below), whose sum is σ = 125413596. Its totient is φ = 14212800.

The previous prime is 42640957. The next prime is 42641009. The reversal of 42640992 is 29904624.

42640992 is a `hidden beast` number, since 4 + 2 + 640 + 9 + 9 + 2 = 666.

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, 5634 + ... + 10817.

Almost surely, 2^42640992 is an apocalyptic number.

It is an amenable number.

42640992 is an abundant number, since it is smaller than the sum of its proper divisors (82772604).

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

42640992 is a wasteful number, since it uses less digits than its factorization.

42640992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16473 (or 16456 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 42640992 is about 6530.0070444066. The cubic root of 42640992 is about 349.3620815583.

The spelling of 42640992 in words is "forty-two million, six hundred forty thousand, nine hundred ninety-two".