427976391 has 8 divisors (see below), whose sum is σ = 571992304. Its totient is φ = 284639040.

The previous prime is 427976333. The next prime is 427976399. The reversal of 427976391 is 193679724.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 427976391 - 2¹¹ = 427974343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 427976391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427976399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168166 + ... + 170691.

It is an arithmetic number, because the mean of its divisors is an integer number (71499038).

Almost surely, 2^427976391 is an apocalyptic number.

427976391 is a deficient number, since it is larger than the sum of its proper divisors (144015913).

427976391 is a wasteful number, since it uses less digits than its factorization.

427976391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339281.

The product of its digits is 571536, while the sum is 48.

The square root of 427976391 is about 20687.5902656641. The cubic root of 427976391 is about 753.5983473628.

The spelling of 427976391 in words is "four hundred twenty-seven million, nine hundred seventy-six thousand, three hundred ninety-one".