1998124564 has 12 divisors (see below), whose sum is σ = 3540980800. Its totient is φ = 986415768.

The previous prime is 1998124547. The next prime is 1998124571. The reversal of 1998124564 is 4654218991.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3161274 + ... + 3161905.

Almost surely, 2^1998124564 is an apocalyptic number.

It is an amenable number.

1998124564 is a deficient number, since it is larger than the sum of its proper divisors (1542856236).

1998124564 is a wasteful number, since it uses less digits than its factorization.

1998124564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323262 (or 6323260 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 1998124564 is about 44700.3866202520. The cubic root of 1998124564 is about 1259.5271098520.

The spelling of 1998124564 in words is "one billion, nine hundred ninety-eight million, one hundred twenty-four thousand, five hundred sixty-four".