47715421 has 4 divisors (see below), whose sum is σ = 51385852. Its totient is φ = 44044992.

The previous prime is 47715397. The next prime is 47715433. The reversal of 47715421 is 12451774.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29822521 + 17892900 = 5461^2 + 4230^2 .

It is a cyclic number.

It is not a de Polignac number, because 47715421 - 2⁵ = 47715389 is a prime.

It is a super-2 number, since 2×47715421² = 4553522802414482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47725421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835196 + ... + 1835221.

It is an arithmetic number, because the mean of its divisors is an integer number (12846463).

Almost surely, 2^47715421 is an apocalyptic number.

It is an amenable number.

47715421 is a deficient number, since it is larger than the sum of its proper divisors (3670431).

47715421 is a wasteful number, since it uses less digits than its factorization.

47715421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670430.

The product of its digits is 7840, while the sum is 31.

The square root of 47715421 is about 6907.6349787753. The cubic root of 47715421 is about 362.7044801161.

The spelling of 47715421 in words is "forty-seven million, seven hundred fifteen thousand, four hundred twenty-one".