1897503997 has 4 divisors (see below), whose sum is σ = 1898004160. Its totient is φ = 1897003836.

The previous prime is 1897503973. The next prime is 1897504001. The reversal of 1897503997 is 7993057981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1897503997 - 2²⁷ = 1763286269 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 (1897503497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244347 + ... + 251992.

It is an arithmetic number, because the mean of its divisors is an integer number (474501040).

Almost surely, 2^1897503997 is an apocalyptic number.

It is an amenable number.

1897503997 is a deficient number, since it is larger than the sum of its proper divisors (500163).

1897503997 is an equidigital number, since it uses as much as digits as its factorization.

1897503997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500162.

The product of its (nonzero) digits is 4286520, while the sum is 58.

The square root of 1897503997 is about 43560.3489081527. The cubic root of 1897503997 is about 1238.0197313823.

The spelling of 1897503997 in words is "one billion, eight hundred ninety-seven million, five hundred three thousand, nine hundred ninety-seven".