47840940 has 144 divisors (see below), whose sum is σ = 169897728. Its totient is φ = 10668672.

The previous prime is 47840929. The next prime is 47840987. The reversal of 47840940 is 4904874.

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 = 47840895 and 47840904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53739 + ... + 54621.

Almost surely, 2^47840940 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 47840940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84948864).

47840940 is an abundant number, since it is smaller than the sum of its proper divisors (122056788).

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

47840940 is a wasteful number, since it uses less digits than its factorization.

47840940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 47840940 is about 6916.7145379869. The cubic root of 47840940 is about 363.0222421087.

The spelling of 47840940 in words is "forty-seven million, eight hundred forty thousand, nine hundred forty".