47021904 has 80 divisors (see below), whose sum is σ = 136598400. Its totient is φ = 15485184.

The previous prime is 47021861. The next prime is 47021921. The reversal of 47021904 is 40912074.

It is a happy number.

47021904 is a `hidden beast` number, since 470 + 2 + 190 + 4 = 666.

It is a super-2 number, since 2×47021904² = 4422118911570432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37837 + ... + 39059.

It is an arithmetic number, because the mean of its divisors is an integer number (1707480).

Almost surely, 2^47021904 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 47021904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68299200).

47021904 is an abundant number, since it is smaller than the sum of its proper divisors (89576496).

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

47021904 is a wasteful number, since it uses less digits than its factorization.

47021904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329 (or 1317 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 47021904 is about 6857.2519277040. The cubic root of 47021904 is about 360.9386615243.

Adding to 47021904 its reverse (40912074), we get a palindrome (87933978).

The spelling of 47021904 in words is "forty-seven million, twenty-one thousand, nine hundred four".