47723991 has 32 divisors (see below), whose sum is σ = 78144000. Its totient is φ = 25824960.

The previous prime is 47723989. The next prime is 47723993. The reversal of 47723991 is 19932774.

It is an interprime number because it is at equal distance from previous prime (47723989) and next prime (47723993).

It is not a de Polignac number, because 47723991 - 2¹ = 47723989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47723993) 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, 18331 + ... + 20771.

It is an arithmetic number, because the mean of its divisors is an integer number (2442000).

Almost surely, 2^47723991 is an apocalyptic number.

47723991 is a deficient number, since it is larger than the sum of its proper divisors (30420009).

47723991 is a wasteful number, since it uses less digits than its factorization.

47723991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484 (or 2470 counting only the distinct ones).

The product of its digits is 95256, while the sum is 42.

The square root of 47723991 is about 6908.2552790122. The cubic root of 47723991 is about 362.7261935109.

The spelling of 47723991 in words is "forty-seven million, seven hundred twenty-three thousand, nine hundred ninety-one".