2473721 has 4 divisors (see below), whose sum is σ = 2619252. Its totient is φ = 2328192.

The previous prime is 2473717. The next prime is 2473759. The reversal of 2473721 is 1273742.

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 1590121 + 883600 = 1261^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 2473721 - 2² = 2473717 is a prime.

It is a super-2 number, since 2×2473721² = 12238591171682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2473321) 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, 72740 + ... + 72773.

It is an arithmetic number, because the mean of its divisors is an integer number (654813).

2^2473721 is an apocalyptic number.

It is an amenable number.

2473721 is a deficient number, since it is larger than the sum of its proper divisors (145531).

2473721 is a wasteful number, since it uses less digits than its factorization.

2473721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145530.

The product of its digits is 2352, while the sum is 26.

The square root of 2473721 is about 1572.8067268422. The cubic root of 2473721 is about 135.2436569038.

The spelling of 2473721 in words is "two million, four hundred seventy-three thousand, seven hundred twenty-one".