1900349649 has 27 divisors (see below), whose sum is σ = 3019461627. Its totient is φ = 1150855200.

The previous prime is 1900349629. The next prime is 1900349669. The reversal of 1900349649 is 9469430091.

The square root of 1900349649 is 43593.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1900349629) and next prime (1900349669).

It can be written as a sum of positive squares in only one way, i.e., 1759215249 + 141134400 = 41943^2 + 11880^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1900349649 is a prime.

It is a super-2 number, since 2×1900349649² = 7222657576908846402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1900349629) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1437909 + ... + 1439229.

Almost surely, 2^1900349649 is an apocalyptic number.

1900349649 is the 43593-rd square number.

1900349649 is the 21797-th centered octagonal number.

It is an amenable number.

1900349649 is a deficient number, since it is larger than the sum of its proper divisors (1119111978).

1900349649 is an equidigital number, since it uses as much as digits as its factorization.

1900349649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670 (or 1335 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The cubic root of 1900349649 is about 1238.6383007737.

The spelling of 1900349649 in words is "one billion, nine hundred million, three hundred forty-nine thousand, six hundred forty-nine".