47292721 has 16 divisors (see below), whose sum is σ = 55641600. Its totient is φ = 39352320.

The previous prime is 47292683. The next prime is 47292769. The reversal of 47292721 is 12729274.

It is a happy number.

It is not a de Polignac number, because 47292721 - 2¹⁷ = 47161649 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (47292781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105105 + ... + 105553.

It is an arithmetic number, because the mean of its divisors is an integer number (3477600).

Almost surely, 2^47292721 is an apocalyptic number.

47292721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

47292721 is a deficient number, since it is larger than the sum of its proper divisors (8348879).

47292721 is a wasteful number, since it uses less digits than its factorization.

47292721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864.

The product of its digits is 14112, while the sum is 34.

The square root of 47292721 is about 6876.9703358383. The cubic root of 47292721 is about 361.6302630885.

The spelling of 47292721 in words is "forty-seven million, two hundred ninety-two thousand, seven hundred twenty-one".