47757421 has 2 divisors, whose sum is σ = 47757422. Its totient is φ = 47757420.

The previous prime is 47757397. The next prime is 47757427. The reversal of 47757421 is 12475774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38576521 + 9180900 = 6211^2 + 3030^2 .

It is a cyclic number.

It is not a de Polignac number, because 47757421 - 2⁵ = 47757389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47757427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23878710 + 23878711.

It is an arithmetic number, because the mean of its divisors is an integer number (23878711).

Almost surely, 2^47757421 is an apocalyptic number.

It is an amenable number.

47757421 is a deficient number, since it is larger than the sum of its proper divisors (1).

47757421 is an equidigital number, since it uses as much as digits as its factorization.

47757421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54880, while the sum is 37.

The square root of 47757421 is about 6910.6744243959. The cubic root of 47757421 is about 362.8108686477.

The spelling of 47757421 in words is "forty-seven million, seven hundred fifty-seven thousand, four hundred twenty-one".