47909940 has 96 divisors (see below), whose sum is σ = 145635840. Its totient is φ = 11698176.

The previous prime is 47909929. The next prime is 47909977. The reversal of 47909940 is 4990974.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 47909892 and 47909901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186292 + ... + 186548.

It is an arithmetic number, because the mean of its divisors is an integer number (1517040).

Almost surely, 2^47909940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47909940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72817920).

47909940 is an abundant number, since it is smaller than the sum of its proper divisors (97725900).

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

47909940 is a wasteful number, since it uses less digits than its factorization.

47909940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 47909940 is about 6921.7006580753. The cubic root of 47909940 is about 363.1966847654.

The spelling of 47909940 in words is "forty-seven million, nine hundred nine thousand, nine hundred forty".