47309138 has 4 divisors (see below), whose sum is σ = 70963710. Its totient is φ = 23654568.

The previous prime is 47309117. The next prime is 47309149. The reversal of 47309138 is 83190374.

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

It can be written as a sum of positive squares in only one way, i.e., 25472209 + 21836929 = 5047^2 + 4673^2 .

It is a junction number, because it is equal to n+sod(n) for n = 47309098 and 47309107.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11827283 + ... + 11827286.

Almost surely, 2^47309138 is an apocalyptic number.

47309138 is a deficient number, since it is larger than the sum of its proper divisors (23654572).

47309138 is a wasteful number, since it uses less digits than its factorization.

47309138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23654571.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 47309138 is about 6878.1638538203. The cubic root of 47309138 is about 361.6721031932.

The spelling of 47309138 in words is "forty-seven million, three hundred nine thousand, one hundred thirty-eight".