427638971 has 4 divisors (see below), whose sum is σ = 429183072. Its totient is φ = 426094872.

The previous prime is 427638943. The next prime is 427638973. The reversal of 427638971 is 179836724.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 427638971 - 2⁶ = 427638907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427638973) 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, 771635 + ... + 772188.

It is an arithmetic number, because the mean of its divisors is an integer number (107295768).

Almost surely, 2^427638971 is an apocalyptic number.

427638971 is a deficient number, since it is larger than the sum of its proper divisors (1544101).

427638971 is a wasteful number, since it uses less digits than its factorization.

427638971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544100.

The product of its digits is 508032, while the sum is 47.

The square root of 427638971 is about 20679.4335270577. The cubic root of 427638971 is about 753.4002476435.

The spelling of 427638971 in words is "four hundred twenty-seven million, six hundred thirty-eight thousand, nine hundred seventy-one".