427979688209 has 4 divisors (see below), whose sum is σ = 453154964004. Its totient is φ = 402804412416.

The previous prime is 427979688181. The next prime is 427979688281. The reversal of 427979688209 is 902886979724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 322141380625 + 105838307584 = 567575^2 + 325328^2 .

It is a cyclic number.

It is not a de Polignac number, because 427979688209 - 2²⁴ = 427962910993 is a prime.

It is a super-2 number, since 2×427979688209² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427979688809) 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, 12587637872 + ... + 12587637905.

It is an arithmetic number, because the mean of its divisors is an integer number (113288741001).

Almost surely, 2^427979688209 is an apocalyptic number.

It is an amenable number.

427979688209 is a deficient number, since it is larger than the sum of its proper divisors (25175275795).

427979688209 is a wasteful number, since it uses less digits than its factorization.

427979688209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25175275794.

The product of its (nonzero) digits is 219469824, while the sum is 71.

The spelling of 427979688209 in words is "four hundred twenty-seven billion, nine hundred seventy-nine million, six hundred eighty-eight thousand, two hundred nine".