47899421 has 4 divisors (see below), whose sum is σ = 50717052. Its totient is φ = 45081792.

The previous prime is 47899393. The next prime is 47899427. The reversal of 47899421 is 12499874.

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 34975396 + 12924025 = 5914^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 47899421 - 2¹⁸ = 47637277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47899427) 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, 1408790 + ... + 1408823.

It is an arithmetic number, because the mean of its divisors is an integer number (12679263).

Almost surely, 2^47899421 is an apocalyptic number.

It is an amenable number.

47899421 is a deficient number, since it is larger than the sum of its proper divisors (2817631).

47899421 is a wasteful number, since it uses less digits than its factorization.

47899421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817630.

The product of its digits is 145152, while the sum is 44.

The square root of 47899421 is about 6920.9407597522. The cubic root of 47899421 is about 363.1701019340.

It can be divided in two parts, 478 and 99421, that added together give a palindrome (99899).

The spelling of 47899421 in words is "forty-seven million, eight hundred ninety-nine thousand, four hundred twenty-one".