2471721 has 8 divisors (see below), whose sum is σ = 3766464. Its totient is φ = 1412400.

The previous prime is 2471717. The next prime is 2471737. The reversal of 2471721 is 1271742.

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

It is not a de Polignac number, because 2471721 - 2² = 2471717 is a prime.

It is a super-2 number, since 2×2471721² = 12218809403682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2471691 and 2471700.

It is not an unprimeable number, because it can be changed into a prime (2471701) 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, 58830 + ... + 58871.

It is an arithmetic number, because the mean of its divisors is an integer number (470808).

2^2471721 is an apocalyptic number.

2471721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2471721 is a deficient number, since it is larger than the sum of its proper divisors (1294743).

2471721 is a wasteful number, since it uses less digits than its factorization.

2471721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117711.

The product of its digits is 784, while the sum is 24.

The square root of 2471721 is about 1572.1707922487. The cubic root of 2471721 is about 135.2071989736.

The spelling of 2471721 in words is "two million, four hundred seventy-one thousand, seven hundred twenty-one".