47721123 has 8 divisors (see below), whose sum is σ = 70698000. Its totient is φ = 31814064.

The previous prime is 47721071. The next prime is 47721131. The reversal of 47721123 is 32112774.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-47721123 is a prime.

It is a super-2 number, since 2×47721123² = 4554611160762258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1767449 = 47721123 / (4 + 7 + 7 + 2 + 1 + 1 + 2 + 3).

It is not an unprimeable number, because it can be changed into a prime (47721173) 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, 883698 + ... + 883751.

It is an arithmetic number, because the mean of its divisors is an integer number (8837250).

Almost surely, 2^47721123 is an apocalyptic number.

47721123 is a deficient number, since it is larger than the sum of its proper divisors (22976877).

47721123 is a wasteful number, since it uses less digits than its factorization.

47721123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767458 (or 1767452 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 47721123 is about 6908.0476981561. The cubic root of 47721123 is about 362.7189272873.

Adding to 47721123 its reverse (32112774), we get a palindrome (79833897).

The spelling of 47721123 in words is "forty-seven million, seven hundred twenty-one thousand, one hundred twenty-three".