1649693756 has 6 divisors (see below), whose sum is σ = 2886964080. Its totient is φ = 824846876.

The previous prime is 1649693713. The next prime is 1649693761. The reversal of 1649693756 is 6573969461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206211716 + ... + 206211723.

It is an arithmetic number, because the mean of its divisors is an integer number (481160680).

Almost surely, 2^1649693756 is an apocalyptic number.

It is an amenable number.

1649693756 is a deficient number, since it is larger than the sum of its proper divisors (1237270324).

1649693756 is a wasteful number, since it uses less digits than its factorization.

1649693756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412423443 (or 412423441 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 56.

The square root of 1649693756 is about 40616.4222451954. The cubic root of 1649693756 is about 1181.5926392681.

The spelling of 1649693756 in words is "one billion, six hundred forty-nine million, six hundred ninety-three thousand, seven hundred fifty-six".