1997913599 has 16 divisors (see below), whose sum is σ = 2227474080. Its totient is φ = 1776552960.

The previous prime is 1997913587. The next prime is 1997913613. The reversal of 1997913599 is 9953197991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1997913599 - 2¹² = 1997909503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997913529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191387 + ... + 201555.

It is an arithmetic number, because the mean of its divisors is an integer number (139217130).

Almost surely, 2^1997913599 is an apocalyptic number.

1997913599 is a deficient number, since it is larger than the sum of its proper divisors (229560481).

1997913599 is a wasteful number, since it uses less digits than its factorization.

1997913599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570.

The product of its digits is 6200145, while the sum is 62.

The square root of 1997913599 is about 44698.0267908998. The cubic root of 1997913599 is about 1259.4827807022.

The spelling of 1997913599 in words is "one billion, nine hundred ninety-seven million, nine hundred thirteen thousand, five hundred ninety-nine".