47240821 has 12 divisors (see below), whose sum is σ = 50365152. Its totient is φ = 44299944.

The previous prime is 47240813. The next prime is 47240833. The reversal of 47240821 is 12804274.

It is not a de Polignac number, because 47240821 - 2³ = 47240813 is a prime.

It is a super-3 number, since 3×47240821³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47240821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47240891) 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, 38016 + ... + 39238.

It is an arithmetic number, because the mean of its divisors is an integer number (4197096).

Almost surely, 2^47240821 is an apocalyptic number.

It is an amenable number.

47240821 is a deficient number, since it is larger than the sum of its proper divisors (3124331).

47240821 is a wasteful number, since it uses less digits than its factorization.

47240821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1349 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 47240821 is about 6873.1958359994. The cubic root of 47240821 is about 361.4979278500.

The spelling of 47240821 in words is "forty-seven million, two hundred forty thousand, eight hundred twenty-one".