1900609493 has 4 divisors (see below), whose sum is σ = 1902753120. Its totient is φ = 1898465868.

The previous prime is 1900609481. The next prime is 1900609517. The reversal of 1900609493 is 3949060091.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3949060091 = 149 ⋅26503759.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1900609493 is a prime.

It is a super-2 number, since 2×1900609493² = 7224632889763434098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1900609493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900609423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070483 + ... + 1072256.

It is an arithmetic number, because the mean of its divisors is an integer number (475688280).

Almost surely, 2^1900609493 is an apocalyptic number.

It is an amenable number.

1900609493 is a deficient number, since it is larger than the sum of its proper divisors (2143627).

1900609493 is an equidigital number, since it uses as much as digits as its factorization.

1900609493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143626.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 1900609493 is about 43595.9802390083. The cubic root of 1900609493 is about 1238.6947532029.

The spelling of 1900609493 in words is "one billion, nine hundred million, six hundred nine thousand, four hundred ninety-three".