1649838499 has 4 divisors (see below), whose sum is σ = 1650649680. Its totient is φ = 1649027320.

The previous prime is 1649838493. The next prime is 1649838503. The reversal of 1649838499 is 9948389461.

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 1649838499 - 2⁵ = 1649838467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649838493) 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, 402532 + ... + 406609.

It is an arithmetic number, because the mean of its divisors is an integer number (412662420).

Almost surely, 2^1649838499 is an apocalyptic number.

1649838499 is a deficient number, since it is larger than the sum of its proper divisors (811181).

1649838499 is an equidigital number, since it uses as much as digits as its factorization.

1649838499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811180.

The product of its digits is 13436928, while the sum is 61.

The square root of 1649838499 is about 40618.2040346444. The cubic root of 1649838499 is about 1181.6271956337.

The spelling of 1649838499 in words is "one billion, six hundred forty-nine million, eight hundred thirty-eight thousand, four hundred ninety-nine".