1649393937 has 24 divisors (see below), whose sum is σ = 2478925800. Its totient is φ = 1055513088.

The previous prime is 1649393791. The next prime is 1649393947. The reversal of 1649393937 is 7393939461.

1649393937 is a `hidden beast` number, since 164 + 9 + 393 + 93 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 822026241 + 827367696 = 28671^2 + 28764^2 .

It is not a de Polignac number, because 1649393937 - 2¹¹ = 1649391889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649393947) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 26889 + ... + 63417.

It is an arithmetic number, because the mean of its divisors is an integer number (103288575).

Almost surely, 2^1649393937 is an apocalyptic number.

It is an amenable number.

1649393937 is a deficient number, since it is larger than the sum of its proper divisors (829531863).

1649393937 is a wasteful number, since it uses less digits than its factorization.

1649393937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36737 (or 36734 counting only the distinct ones).

The product of its digits is 3306744, while the sum is 54.

The square root of 1649393937 is about 40612.7312181784. The cubic root of 1649393937 is about 1181.5210531761.

The spelling of 1649393937 in words is "one billion, six hundred forty-nine million, three hundred ninety-three thousand, nine hundred thirty-seven".