47758921 has 4 divisors (see below), whose sum is σ = 54581632. Its totient is φ = 40936212.

The previous prime is 47758901. The next prime is 47758943. The reversal of 47758921 is 12985774.

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: 12985774 = 2 ⋅6492887.

It is a cyclic number.

It is not a de Polignac number, because 47758921 - 2¹¹ = 47756873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47758901) 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, 3411345 + ... + 3411358.

It is an arithmetic number, because the mean of its divisors is an integer number (13645408).

Almost surely, 2^47758921 is an apocalyptic number.

It is an amenable number.

47758921 is a deficient number, since it is larger than the sum of its proper divisors (6822711).

47758921 is an equidigital number, since it uses as much as digits as its factorization.

47758921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822710.

The product of its digits is 141120, while the sum is 43.

The square root of 47758921 is about 6910.7829513015. The cubic root of 47758921 is about 362.8146670843.

The spelling of 47758921 in words is "forty-seven million, seven hundred fifty-eight thousand, nine hundred twenty-one".