427392721 has 4 divisors (see below), whose sum is σ = 488448832. Its totient is φ = 366336612.

The previous prime is 427392709. The next prime is 427392743. The reversal of 427392721 is 127293724.

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 a cyclic number.

It is not a de Polignac number, because 427392721 - 2⁹ = 427392209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427392701) 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, 30528045 + ... + 30528058.

It is an arithmetic number, because the mean of its divisors is an integer number (122112208).

Almost surely, 2^427392721 is an apocalyptic number.

It is an amenable number.

427392721 is a deficient number, since it is larger than the sum of its proper divisors (61056111).

427392721 is an equidigital number, since it uses as much as digits as its factorization.

427392721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61056110.

The product of its digits is 42336, while the sum is 37.

The square root of 427392721 is about 20673.4786864717. The cubic root of 427392721 is about 753.2556081651.

The spelling of 427392721 in words is "four hundred twenty-seven million, three hundred ninety-two thousand, seven hundred twenty-one".