1900389 has 4 divisors (see below), whose sum is σ = 2533856. Its totient is φ = 1266924.

The previous prime is 1900373. The next prime is 1900397. The reversal of 1900389 is 9830091.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1900389 - 2⁴ = 1900373 is a prime.

It is a super-2 number, since 2×1900389² = 7222956702642, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900369) 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, 316729 + ... + 316734.

It is an arithmetic number, because the mean of its divisors is an integer number (633464).

2^1900389 is an apocalyptic number.

It is an amenable number.

1900389 is a deficient number, since it is larger than the sum of its proper divisors (633467).

1900389 is an equidigital number, since it uses as much as digits as its factorization.

1900389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633466.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1900389 is about 1378.5459731181. The cubic root of 1900389 is about 123.8646850309.

The spelling of 1900389 in words is "one million, nine hundred thousand, three hundred eighty-nine".