47920621 has 4 divisors (see below), whose sum is σ = 54766432. Its totient is φ = 41074812.

The previous prime is 47920583. The next prime is 47920633. The reversal of 47920621 is 12602974.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12602974 = 2 ⋅6301487.

It is a cyclic number.

It is not a de Polignac number, because 47920621 - 2⁷ = 47920493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47920121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3422895 + ... + 3422908.

It is an arithmetic number, because the mean of its divisors is an integer number (13691608).

Almost surely, 2^47920621 is an apocalyptic number.

It is an amenable number.

47920621 is a deficient number, since it is larger than the sum of its proper divisors (6845811).

47920621 is an equidigital number, since it uses as much as digits as its factorization.

47920621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6845810.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 47920621 is about 6922.4721740141. The cubic root of 47920621 is about 363.2236730100.

The spelling of 47920621 in words is "forty-seven million, nine hundred twenty thousand, six hundred twenty-one".