47390905 has 4 divisors (see below), whose sum is σ = 56869092. Its totient is φ = 37912720.

The previous prime is 47390887. The next prime is 47390923. The reversal of 47390905 is 50909374.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (47390887) and next prime (47390923).

It can be written as a sum of positive squares in 2 ways, for example, as 25684624 + 21706281 = 5068^2 + 4659^2 .

It is not a de Polignac number, because 47390905 - 2⁵ = 47390873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4739086 + ... + 4739095.

It is an arithmetic number, because the mean of its divisors is an integer number (14217273).

Almost surely, 2^47390905 is an apocalyptic number.

It is an amenable number.

47390905 is a deficient number, since it is larger than the sum of its proper divisors (9478187).

47390905 is an equidigital number, since it uses as much as digits as its factorization.

47390905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9478186.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 47390905 is about 6884.1052432397. The cubic root of 47390905 is about 361.8803492318.

It can be divided in two parts, 473 and 90905, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 47390905 in words is "forty-seven million, three hundred ninety thousand, nine hundred five".