623731 has 4 divisors (see below), whose sum is σ = 626752. Its totient is φ = 620712.

The previous prime is 623729. The next prime is 623743. The reversal of 623731 is 137326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 623731 - 2¹ = 623729 is a prime.

It is a super-2 number, since 2×623731² = 778080720722, which contains 22 as substring.

It is a Duffinian number.

623731 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (623771) 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, 1176 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (156688).

2⁶²³⁷³¹ is an apocalyptic number.

623731 is a deficient number, since it is larger than the sum of its proper divisors (3021).

623731 is a wasteful number, since it uses less digits than its factorization.

623731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020.

The product of its digits is 756, while the sum is 22.

The square root of 623731 is about 789.7664211651. The cubic root of 623731 is about 85.4408925401.

The spelling of 623731 in words is "six hundred twenty-three thousand, seven hundred thirty-one".