47391538 has 4 divisors (see below), whose sum is σ = 71087310. Its totient is φ = 23695768.

The previous prime is 47391511. The next prime is 47391551. The reversal of 47391538 is 83519374.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83519374 = 2 ⋅41759687.

It can be written as a sum of positive squares in only one way, i.e., 45657049 + 1734489 = 6757^2 + 1317^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 47391538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11847883 + ... + 11847886.

Almost surely, 2^47391538 is an apocalyptic number.

47391538 is a deficient number, since it is larger than the sum of its proper divisors (23695772).

47391538 is a wasteful number, since it uses less digits than its factorization.

47391538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23695771.

The product of its digits is 90720, while the sum is 40.

The square root of 47391538 is about 6884.1512185599. The cubic root of 47391538 is about 361.8819604358.

The spelling of 47391538 in words is "forty-seven million, three hundred ninety-one thousand, five hundred thirty-eight".