42621740 has 48 divisors (see below), whose sum is σ = 102961152. Its totient is φ = 14517696.

The previous prime is 42621727. The next prime is 42621749. The reversal of 42621740 is 4712624.

It is a super-2 number, since 2×42621740² = 3633225441255200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42621749) 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, 22469 + ... + 24291.

It is an arithmetic number, because the mean of its divisors is an integer number (2145024).

Almost surely, 2^42621740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42621740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51480576).

42621740 is an abundant number, since it is smaller than the sum of its proper divisors (60339412).

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

42621740 is a wasteful number, since it uses less digits than its factorization.

42621740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 42621740 is about 6528.5327601231. The cubic root of 42621740 is about 349.3094957641.

The spelling of 42621740 in words is "forty-two million, six hundred twenty-one thousand, seven hundred forty".