427370721 has 4 divisors (see below), whose sum is σ = 569827632. Its totient is φ = 284913812.

The previous prime is 427370719. The next prime is 427370731. The reversal of 427370721 is 127073724.

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 427370721 - 2¹ = 427370719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (427370711) 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, 71228451 + ... + 71228456.

It is an arithmetic number, because the mean of its divisors is an integer number (142456908).

Almost surely, 2^427370721 is an apocalyptic number.

It is an amenable number.

427370721 is a deficient number, since it is larger than the sum of its proper divisors (142456911).

427370721 is a wasteful number, since it uses less digits than its factorization.

427370721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142456910.

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 427370721 is about 20672.9465969416. The cubic root of 427370721 is about 753.2426833562.

The spelling of 427370721 in words is "four hundred twenty-seven million, three hundred seventy thousand, seven hundred twenty-one".