47157840 has 60 divisors (see below), whose sum is σ = 158374164. Its totient is φ = 12575232.

The previous prime is 47157839. The next prime is 47157841. The reversal of 47157840 is 4875174.

47157840 is a `hidden beast` number, since 47 + 1 + 578 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (47157839) and next prime (47157841).

It can be written as a sum of positive squares in 2 ways, for example, as 20034576 + 27123264 = 4476^2 + 5208^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 47157795 and 47157804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47157841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32029 + ... + 33468.

Almost surely, 2^47157840 is an apocalyptic number.

47157840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

47157840 is an abundant number, since it is smaller than the sum of its proper divisors (111216324).

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

47157840 is a wasteful number, since it uses less digits than its factorization.

47157840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65516 (or 65507 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 47157840 is about 6867.1566168248. The cubic root of 47157840 is about 361.2861403880.

It can be divided in two parts, 471 and 57840, that added together give a triangular number (58311 = T₃₄₁).

The spelling of 47157840 in words is "forty-seven million, one hundred fifty-seven thousand, eight hundred forty".