47439813 has 4 divisors (see below), whose sum is σ = 63253088. Its totient is φ = 31626540.

The previous prime is 47439781. The next prime is 47439839. The reversal of 47439813 is 31893474.

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.

It is not a de Polignac number, because 47439813 - 2⁵ = 47439781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47439863) 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, 7906633 + ... + 7906638.

It is an arithmetic number, because the mean of its divisors is an integer number (15813272).

Almost surely, 2^47439813 is an apocalyptic number.

It is an amenable number.

47439813 is a deficient number, since it is larger than the sum of its proper divisors (15813275).

47439813 is a wasteful number, since it uses less digits than its factorization.

47439813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15813274.

The product of its digits is 72576, while the sum is 39.

The square root of 47439813 is about 6887.6565680934. The cubic root of 47439813 is about 362.0047947637.

The spelling of 47439813 in words is "forty-seven million, four hundred thirty-nine thousand, eight hundred thirteen".