478307831 has 4 divisors (see below), whose sum is σ = 478717464. Its totient is φ = 477898200.

The previous prime is 478307827. The next prime is 478307833. The reversal of 478307831 is 138703874.

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 478307831 - 2² = 478307827 is a prime.

It is a super-2 number, since 2×478307831² = 457556762391849122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478307833) 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, 203060 + ... + 205401.

It is an arithmetic number, because the mean of its divisors is an integer number (119679366).

Almost surely, 2^478307831 is an apocalyptic number.

478307831 is a deficient number, since it is larger than the sum of its proper divisors (409633).

478307831 is a wasteful number, since it uses less digits than its factorization.

478307831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409632.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 478307831 is about 21870.2499071227. The cubic root of 478307831 is about 782.0523591161.

The spelling of 478307831 in words is "four hundred seventy-eight million, three hundred seven thousand, eight hundred thirty-one".