1797920690 has 8 divisors (see below), whose sum is σ = 3236257260. Its totient is φ = 719168272.

The previous prime is 1797920669. The next prime is 1797920713. The reversal of 1797920690 is 960297971.

It can be written as a sum of positive squares in 2 ways, for example, as 1510177321 + 287743369 = 38861^2 + 16963^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1797920690² = 6465037615060152200, which contains 22 as substring.

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, 89896025 + ... + 89896044.

Almost surely, 2^1797920690 is an apocalyptic number.

1797920690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1797920690 is a deficient number, since it is larger than the sum of its proper divisors (1438336570).

1797920690 is a wasteful number, since it uses less digits than its factorization.

1797920690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179792076.

The product of its (nonzero) digits is 428652, while the sum is 50.

The square root of 1797920690 is about 42401.8948869033. The cubic root of 1797920690 is about 1215.9718192518.

The spelling of 1797920690 in words is "one billion, seven hundred ninety-seven million, nine hundred twenty thousand, six hundred ninety".