1797904538 has 4 divisors (see below), whose sum is σ = 2696856810. Its totient is φ = 898952268.

The previous prime is 1797904501. The next prime is 1797904573. The reversal of 1797904538 is 8354097971.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1372183849 + 425720689 = 37043^2 + 20633^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1797904538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449476133 + ... + 449476136.

Almost surely, 2^1797904538 is an apocalyptic number.

1797904538 is a deficient number, since it is larger than the sum of its proper divisors (898952272).

1797904538 is an equidigital number, since it uses as much as digits as its factorization.

1797904538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898952271.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 1797904538 is about 42401.7044232894. The cubic root of 1797904538 is about 1215.9681779278.

The spelling of 1797904538 in words is "one billion, seven hundred ninety-seven million, nine hundred four thousand, five hundred thirty-eight".