42621731 has 8 divisors (see below), whose sum is σ = 45017280. Its totient is φ = 40241448.

The previous prime is 42621727. The next prime is 42621749. The reversal of 42621731 is 13712624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42621731 - 2² = 42621727 is a prime.

It is a super-2 number, since 2×42621731² = 3633223906872722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42621731.

It is not an unprimeable number, because it can be changed into a prime (42621701) 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, 2180 + ... + 9486.

It is an arithmetic number, because the mean of its divisors is an integer number (5627160).

Almost surely, 2^42621731 is an apocalyptic number.

42621731 is a deficient number, since it is larger than the sum of its proper divisors (2395549).

42621731 is a wasteful number, since it uses less digits than its factorization.

42621731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7633.

The product of its digits is 2016, while the sum is 26.

The square root of 42621731 is about 6528.5320708410. The cubic root of 42621731 is about 349.3094711774.

The spelling of 42621731 in words is "forty-two million, six hundred twenty-one thousand, seven hundred thirty-one".