42577921 has 8 divisors (see below), whose sum is σ = 43908480. Its totient is φ = 41266992.

The previous prime is 42577891. The next prime is 42577937. The reversal of 42577921 is 12977524.

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 42577921 - 2¹¹ = 42575873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42577981) 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, 441 + ... + 9238.

It is an arithmetic number, because the mean of its divisors is an integer number (5488560).

Almost surely, 2^42577921 is an apocalyptic number.

It is an amenable number.

42577921 is a deficient number, since it is larger than the sum of its proper divisors (1330559).

42577921 is an equidigital number, since it uses as much as digits as its factorization.

42577921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9815.

The product of its digits is 35280, while the sum is 37.

The square root of 42577921 is about 6525.1759363254. The cubic root of 42577921 is about 349.1897474757.

The spelling of 42577921 in words is "forty-two million, five hundred seventy-seven thousand, nine hundred twenty-one".