1900386989 has 2 divisors, whose sum is σ = 1900386990. Its totient is φ = 1900386988.

The previous prime is 1900386967. The next prime is 1900386997. The reversal of 1900386989 is 9896830091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1865376100 + 35010889 = 43190^2 + 5917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1900386989 is a prime.

It is a super-2 number, since 2×1900386989² = 7222941415920972242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1900386989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1900386689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950193494 + 950193495.

It is an arithmetic number, because the mean of its divisors is an integer number (950193495).

Almost surely, 2^1900386989 is an apocalyptic number.

It is an amenable number.

1900386989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900386989 is an equidigital number, since it uses as much as digits as its factorization.

1900386989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 1900386989 is about 43593.4282776659. The cubic root of 1900386989 is about 1238.6464133950.

The spelling of 1900386989 in words is "one billion, nine hundred million, three hundred eighty-six thousand, nine hundred eighty-nine".