623809109 has 16 divisors (see below), whose sum is σ = 782248320. Its totient is φ = 483264960.

The previous prime is 623809103. The next prime is 623809129. The reversal of 623809109 is 901908326.

It is a cyclic number.

It is not a de Polignac number, because 623809109 - 2²⁸ = 355373653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623809103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10094 + ... + 36735.

It is an arithmetic number, because the mean of its divisors is an integer number (48890520).

Almost surely, 2^623809109 is an apocalyptic number.

It is an amenable number.

623809109 is a deficient number, since it is larger than the sum of its proper divisors (158439211).

623809109 is a wasteful number, since it uses less digits than its factorization.

623809109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47020.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 623809109 is about 24976.1708234069. The cubic root of 623809109 is about 854.4445894088. Note that the first 3 decimals are identical.

The spelling of 623809109 in words is "six hundred twenty-three million, eight hundred nine thousand, one hundred nine".