47217988 has 12 divisors (see below), whose sum is σ = 86224320. Its totient is φ = 22582472.

The previous prime is 47217977. The next prime is 47218001. The reversal of 47217988 is 88971274.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256528 + ... + 256711.

It is an arithmetic number, because the mean of its divisors is an integer number (7185360).

Almost surely, 2^47217988 is an apocalyptic number.

It is an amenable number.

47217988 is a deficient number, since it is larger than the sum of its proper divisors (39006332).

47217988 is a wasteful number, since it uses less digits than its factorization.

47217988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513266 (or 513264 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The square root of 47217988 is about 6871.5346175363. The cubic root of 47217988 is about 361.4396772934.

It can be divided in two parts, 47217 and 988, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 47217988 in words is "forty-seven million, two hundred seventeen thousand, nine hundred eighty-eight".