1997259904 has 32 divisors (see below), whose sum is σ = 3995625600. Its totient is φ = 994436352.

The previous prime is 1997259893. The next prime is 1997259907. The reversal of 1997259904 is 4099527991.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (1997259907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052 + ... + 63235.

It is an arithmetic number, because the mean of its divisors is an integer number (124863300).

Almost surely, 2^1997259904 is an apocalyptic number.

It is an amenable number.

1997259904 is an abundant number, since it is smaller than the sum of its proper divisors (1998365696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997259904 is an equidigital number, since it uses as much as digits as its factorization.

1997259904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65540 (or 65528 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 55.

The square root of 1997259904 is about 44690.7138452722. The cubic root of 1997259904 is about 1259.3454028219.

The spelling of 1997259904 in words is "one billion, nine hundred ninety-seven million, two hundred fifty-nine thousand, nine hundred four".