427521873 has 4 divisors (see below), whose sum is σ = 570029168. Its totient is φ = 285014580.

The previous prime is 427521863. The next prime is 427521877. The reversal of 427521873 is 378125724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 427521873 - 2⁸ = 427521617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427521877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71253643 + ... + 71253648.

It is an arithmetic number, because the mean of its divisors is an integer number (142507292).

Almost surely, 2^427521873 is an apocalyptic number.

It is an amenable number.

427521873 is a deficient number, since it is larger than the sum of its proper divisors (142507295).

427521873 is a wasteful number, since it uses less digits than its factorization.

427521873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142507294.

The product of its digits is 94080, while the sum is 39.

The square root of 427521873 is about 20676.6020661036. The cubic root of 427521873 is about 753.3314748999.

The spelling of 427521873 in words is "four hundred twenty-seven million, five hundred twenty-one thousand, eight hundred seventy-three".