47217840 has 160 divisors (see below), whose sum is σ = 158132736. Its totient is φ = 11612160.

The previous prime is 47217817. The next prime is 47217847. The reversal of 47217840 is 4871274.

It is not an unprimeable number, because it can be changed into a prime (47217847) 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, 289599 + ... + 289761.

Almost surely, 2^47217840 is an apocalyptic number.

47217840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47217840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79066368).

47217840 is an abundant number, since it is smaller than the sum of its proper divisors (110914896).

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

47217840 is a wasteful number, since it uses less digits than its factorization.

47217840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 47217840 is about 6871.5238484633. The cubic root of 47217840 is about 361.4392996609.

It can be divided in two parts, 4721 and 7840, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 47217840 in words is "forty-seven million, two hundred seventeen thousand, eight hundred forty".