47909397 has 4 divisors (see below), whose sum is σ = 63879200. Its totient is φ = 31939596.

The previous prime is 47909377. The next prime is 47909399. The reversal of 47909397 is 79390974.

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 47909397 - 2¹⁰ = 47908373 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 (47909399) 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, 7984897 + ... + 7984902.

It is an arithmetic number, because the mean of its divisors is an integer number (15969800).

Almost surely, 2^47909397 is an apocalyptic number.

It is an amenable number.

47909397 is a deficient number, since it is larger than the sum of its proper divisors (15969803).

47909397 is a wasteful number, since it uses less digits than its factorization.

47909397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15969802.

The product of its (nonzero) digits is 428652, while the sum is 48.

The square root of 47909397 is about 6921.6614334999. The cubic root of 47909397 is about 363.1953126316.

The spelling of 47909397 in words is "forty-seven million, nine hundred nine thousand, three hundred ninety-seven".