1900019139 has 4 divisors (see below), whose sum is σ = 2533358856. Its totient is φ = 1266679424.

The previous prime is 1900019131. The next prime is 1900019159. The reversal of 1900019139 is 9319100091.

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 1900019139 - 2³ = 1900019131 is a prime.

It is a super-2 number, since 2×1900019139² = 7220145457132602642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1900019131) 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, 316669854 + ... + 316669859.

It is an arithmetic number, because the mean of its divisors is an integer number (633339714).

Almost surely, 2^1900019139 is an apocalyptic number.

1900019139 is a deficient number, since it is larger than the sum of its proper divisors (633339717).

1900019139 is an equidigital number, since it uses as much as digits as its factorization.

1900019139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633339716.

The product of its (nonzero) digits is 2187, while the sum is 33.

The square root of 1900019139 is about 43589.2089742404. The cubic root of 1900019139 is about 1238.5664883608.

The spelling of 1900019139 in words is "one billion, nine hundred million, nineteen thousand, one hundred thirty-nine".