1899764890 has 8 divisors (see below), whose sum is σ = 3419576820. Its totient is φ = 759905952.

The previous prime is 1899764869. The next prime is 1899764891. The reversal of 1899764890 is 984679981.

It can be written as a sum of positive squares in 2 ways, for example, as 1764252009 + 135512881 = 42003^2 + 11641^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1899764891) 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, 94988235 + ... + 94988254.

Almost surely, 2^1899764890 is an apocalyptic number.

1899764890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1899764890 is a deficient number, since it is larger than the sum of its proper divisors (1519811930).

1899764890 is a wasteful number, since it uses less digits than its factorization.

1899764890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189976496.

The product of its (nonzero) digits is 7838208, while the sum is 61.

The square root of 1899764890 is about 43586.2924553121. The cubic root of 1899764890 is about 1238.5112400861.

The spelling of 1899764890 in words is "one billion, eight hundred ninety-nine million, seven hundred sixty-four thousand, eight hundred ninety".