47724021 has 12 divisors (see below), whose sum is σ = 70065580. Its totient is φ = 31294080.

The previous prime is 47724013. The next prime is 47724037. The reversal of 47724021 is 12042774.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5616900 + 42107121 = 2370^2 + 6489^2 .

It is not a de Polignac number, because 47724021 - 2³ = 47724013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47722021) 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, 42916 + ... + 44013.

Almost surely, 2^47724021 is an apocalyptic number.

It is an amenable number.

47724021 is a deficient number, since it is larger than the sum of its proper divisors (22341559).

47724021 is a wasteful number, since it uses less digits than its factorization.

47724021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86996 (or 86993 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 47724021 is about 6908.2574503271. The cubic root of 47724021 is about 362.7262695159.

Adding to 47724021 its reverse (12042774), we get a palindrome (59766795).

The spelling of 47724021 in words is "forty-seven million, seven hundred twenty-four thousand, twenty-one".