47992721 has 4 divisors (see below), whose sum is σ = 54848832. Its totient is φ = 41136612.

The previous prime is 47992691. The next prime is 47992723. The reversal of 47992721 is 12729974.

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 a cyclic number.

It is not a de Polignac number, because 47992721 - 2⁶ = 47992657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47992723) 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, 3428045 + ... + 3428058.

It is an arithmetic number, because the mean of its divisors is an integer number (13712208).

Almost surely, 2^47992721 is an apocalyptic number.

It is an amenable number.

47992721 is a deficient number, since it is larger than the sum of its proper divisors (6856111).

47992721 is an equidigital number, since it uses as much as digits as its factorization.

47992721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856110.

The product of its digits is 63504, while the sum is 41.

The square root of 47992721 is about 6927.6778937823. The cubic root of 47992721 is about 363.4057470533.

The spelling of 47992721 in words is "forty-seven million, nine hundred ninety-two thousand, seven hundred twenty-one".