623444 has 6 divisors (see below), whose sum is σ = 1091034. Its totient is φ = 311720.

The previous prime is 623437. The next prime is 623477. The reversal of 623444 is 444326.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 620944 + 2500 = 788^2 + 50^2 .

It is a super-2 number, since 2×623444² = 777364842272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

623444 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77927 + ... + 77934.

It is an arithmetic number, because the mean of its divisors is an integer number (181839).

2⁶²³⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

623444 is a deficient number, since it is larger than the sum of its proper divisors (467590).

623444 is a wasteful number, since it uses less digits than its factorization.

623444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155865 (or 155863 counting only the distinct ones).

The product of its digits is 2304, while the sum is 23.

The square root of 623444 is about 789.5847009663. The cubic root of 623444 is about 85.4277857691.

The spelling of 623444 in words is "six hundred twenty-three thousand, four hundred forty-four".