1899790345 has 8 divisors (see below), whose sum is σ = 2341363464. Its totient is φ = 1478755584.

The previous prime is 1899790327. The next prime is 1899790357. The reversal of 1899790345 is 5430979981.

It can be written as a sum of positive squares in 4 ways, for example, as 964164601 + 935625744 = 31051^2 + 30588^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1899790345 - 2⁵ = 1899790313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5134384 + ... + 5134753.

It is an arithmetic number, because the mean of its divisors is an integer number (292670433).

Almost surely, 2^1899790345 is an apocalyptic number.

It is an amenable number.

1899790345 is a deficient number, since it is larger than the sum of its proper divisors (441573119).

1899790345 is a wasteful number, since it uses less digits than its factorization.

1899790345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10269179.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 1899790345 is about 43586.5844612766. The cubic root of 1899790345 is about 1238.5167716763.

The spelling of 1899790345 in words is "one billion, eight hundred ninety-nine million, seven hundred ninety thousand, three hundred forty-five".