1899941903 has 4 divisors (see below), whose sum is σ = 1900091328. Its totient is φ = 1899792480.

The previous prime is 1899941899. The next prime is 1899941909. The reversal of 1899941903 is 3091499981.

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

It is a cyclic number.

It is not a de Polignac number, because 1899941903 - 2² = 1899941899 is a prime.

It is a super-2 number, since 2×1899941903² = 7219558469550522818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899941909) 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, 53663 + ... + 81728.

It is an arithmetic number, because the mean of its divisors is an integer number (475022832).

Almost surely, 2^1899941903 is an apocalyptic number.

1899941903 is a deficient number, since it is larger than the sum of its proper divisors (149425).

1899941903 is a wasteful number, since it uses less digits than its factorization.

1899941903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149424.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 1899941903 is about 43588.3230120178. The cubic root of 1899941903 is about 1238.5497055093.

The spelling of 1899941903 in words is "one billion, eight hundred ninety-nine million, nine hundred forty-one thousand, nine hundred three".