1623561398 has 16 divisors (see below), whose sum is σ = 2543191776. Its totient is φ = 775885440.

The previous prime is 1623561383. The next prime is 1623561403. The reversal of 1623561398 is 8931653261.

It is a super-2 number, since 2×1623561398² = 5271903226151428808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49640 + ... + 75572.

It is an arithmetic number, because the mean of its divisors is an integer number (158949486).

Almost surely, 2^1623561398 is an apocalyptic number.

1623561398 is a deficient number, since it is larger than the sum of its proper divisors (919630378).

1623561398 is a wasteful number, since it uses less digits than its factorization.

1623561398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27319.

The product of its digits is 233280, while the sum is 44.

The square root of 1623561398 is about 40293.4411287991. The cubic root of 1623561398 is about 1175.3203045287.

The spelling of 1623561398 in words is "one billion, six hundred twenty-three million, five hundred sixty-one thousand, three hundred ninety-eight".