724981 has 4 divisors (see below), whose sum is σ = 735264. Its totient is φ = 714700.

The previous prime is 724967. The next prime is 724991. The reversal of 724981 is 189427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189427 = 7 ⋅27061.

It is a cyclic number.

It is not a de Polignac number, because 724981 - 2⁵ = 724949 is a prime.

It is a super-2 number, since 2×724981² = 1051194900722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5035 + ... + 5176.

It is an arithmetic number, because the mean of its divisors is an integer number (183816).

2⁷²⁴⁹⁸¹ is an apocalyptic number.

724981 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

724981 is a deficient number, since it is larger than the sum of its proper divisors (10283).

724981 is a wasteful number, since it uses less digits than its factorization.

724981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10282.

The product of its digits is 4032, while the sum is 31.

The square root of 724981 is about 851.4581610390. The cubic root of 724981 is about 89.8343041840.

The spelling of 724981 in words is "seven hundred twenty-four thousand, nine hundred eighty-one".