1623687989 has 24 divisors (see below), whose sum is σ = 2110039680. Its totient is φ = 1221564960.

The previous prime is 1623687979. The next prime is 1623688007. The reversal of 1623687989 is 9897863261.

It is not a de Polignac number, because 1623687989 - 2⁸ = 1623687733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623687979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8489 + ... + 57614.

It is an arithmetic number, because the mean of its divisors is an integer number (87918320).

Almost surely, 2^1623687989 is an apocalyptic number.

It is an amenable number.

1623687989 is a deficient number, since it is larger than the sum of its proper divisors (486351691).

1623687989 is a wasteful number, since it uses less digits than its factorization.

1623687989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66161 (or 66150 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 59.

The square root of 1623687989 is about 40295.0119617801. The cubic root of 1623687989 is about 1175.3508507723.

The spelling of 1623687989 in words is "one billion, six hundred twenty-three million, six hundred eighty-seven thousand, nine hundred eighty-nine".