47397729 has 8 divisors (see below), whose sum is σ = 65235712. Its totient is φ = 30579120.

The previous prime is 47397719. The next prime is 47397767. The reversal of 47397729 is 92779374.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 47397729 - 2⁵ = 47397697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47397719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254734 + ... + 254919.

It is an arithmetic number, because the mean of its divisors is an integer number (8154464).

Almost surely, 2^47397729 is an apocalyptic number.

It is an amenable number.

47397729 is a deficient number, since it is larger than the sum of its proper divisors (17837983).

47397729 is a wasteful number, since it uses less digits than its factorization.

47397729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509687.

The product of its digits is 666792, while the sum is 48.

The square root of 47397729 is about 6884.6008598901. The cubic root of 47397729 is about 361.8977179160.

The spelling of 47397729 in words is "forty-seven million, three hundred ninety-seven thousand, seven hundred twenty-nine".