47172420 has 36 divisors (see below), whose sum is σ = 143090220. Its totient is φ = 12579264.

The previous prime is 47172347. The next prime is 47172439. The reversal of 47172420 is 2427174.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13439556 + 33732864 = 3666^2 + 5808^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130855 + ... + 131214.

Almost surely, 2^47172420 is an apocalyptic number.

It is an amenable number.

47172420 is an abundant number, since it is smaller than the sum of its proper divisors (95917800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47172420 is a wasteful number, since it uses less digits than its factorization.

47172420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262084 (or 262079 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 47172420 is about 6868.2181095245. The cubic root of 47172420 is about 361.3233700346.

Adding to 47172420 its reverse (2427174), we get a palindrome (49599594).

The spelling of 47172420 in words is "forty-seven million, one hundred seventy-two thousand, four hundred twenty".