47092721 has 4 divisors (see below), whose sum is σ = 50715252. Its totient is φ = 43470192.

The previous prime is 47092711. The next prime is 47092741. The reversal of 47092721 is 12729074.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14145121 + 32947600 = 3761^2 + 5740^2 .

It is a cyclic number.

It is not a de Polignac number, because 47092721 - 2¹⁸ = 46830577 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47092711) 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, 1811246 + ... + 1811271.

It is an arithmetic number, because the mean of its divisors is an integer number (12678813).

Almost surely, 2^47092721 is an apocalyptic number.

It is an amenable number.

47092721 is a deficient number, since it is larger than the sum of its proper divisors (3622531).

47092721 is a wasteful number, since it uses less digits than its factorization.

47092721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622530.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 47092721 is about 6862.4136424439. The cubic root of 47092721 is about 361.1197669948.

The spelling of 47092721 in words is "forty-seven million, ninety-two thousand, seven hundred twenty-one".