472399991 has 32 divisors (see below), whose sum is σ = 568995840. Its totient is φ = 383846400.

The previous prime is 472399987. The next prime is 472399997. The reversal of 472399991 is 199993274.

It is not a de Polignac number, because 472399991 - 2² = 472399987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (472399997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1976450 + ... + 1976688.

It is an arithmetic number, because the mean of its divisors is an integer number (17781120).

Almost surely, 2^472399991 is an apocalyptic number.

472399991 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

472399991 is a deficient number, since it is larger than the sum of its proper divisors (96595849).

472399991 is a wasteful number, since it uses less digits than its factorization.

472399991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455.

The product of its digits is 1102248, while the sum is 53.

The square root of 472399991 is about 21734.7645719939. The cubic root of 472399991 is about 778.8191594274.

The spelling of 472399991 in words is "four hundred seventy-two million, three hundred ninety-nine thousand, nine hundred ninety-one".