623969 has 8 divisors (see below), whose sum is σ = 649512. Its totient is φ = 599040.

The previous prime is 623963. The next prime is 623977. The reversal of 623969 is 969326.

It can be written as a sum of positive squares in 4 ways, for example, as 3025 + 620944 = 55^2 + 788^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623969 is a prime.

It is a super-2 number, since 2×623969² = 778674625922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623963) 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, 3137 + ... + 3329.

It is an arithmetic number, because the mean of its divisors is an integer number (81189).

2⁶²³⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

623969 is a deficient number, since it is larger than the sum of its proper divisors (25543).

623969 is a wasteful number, since it uses less digits than its factorization.

623969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307.

The product of its digits is 17496, while the sum is 35.

The square root of 623969 is about 789.9170842563. The cubic root of 623969 is about 85.4517585206.

The spelling of 623969 in words is "six hundred twenty-three thousand, nine hundred sixty-nine".