47139605 has 4 divisors (see below), whose sum is σ = 56567532. Its totient is φ = 37711680.

The previous prime is 47139563. The next prime is 47139607. The reversal of 47139605 is 50693174.

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 22448644 + 24690961 = 4738^2 + 4969^2 .

It is not a de Polignac number, because 47139605 - 2⁶ = 47139541 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 (47139607) 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, 4713956 + ... + 4713965.

It is an arithmetic number, because the mean of its divisors is an integer number (14141883).

Almost surely, 2^47139605 is an apocalyptic number.

It is an amenable number.

47139605 is a deficient number, since it is larger than the sum of its proper divisors (9427927).

47139605 is an equidigital number, since it uses as much as digits as its factorization.

47139605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9427926.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 47139605 is about 6865.8287919231. The cubic root of 47139605 is about 361.2395669931.

The spelling of 47139605 in words is "forty-seven million, one hundred thirty-nine thousand, six hundred five".