1640855049 has 8 divisors (see below), whose sum is σ = 2188357632. Its totient is φ = 1093627920.

The previous prime is 1640855039. The next prime is 1640855053. The reversal of 1640855049 is 9405580461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1640855049 - 2²³ = 1632466441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640855049.

It is not an unprimeable number, because it can be changed into a prime (1640855009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54537 + ... + 79094.

It is an arithmetic number, because the mean of its divisors is an integer number (273544704).

Almost surely, 2^1640855049 is an apocalyptic number.

It is an amenable number.

1640855049 is a deficient number, since it is larger than the sum of its proper divisors (547502583).

1640855049 is a wasteful number, since it uses less digits than its factorization.

1640855049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137727.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 1640855049 is about 40507.4690520156. The cubic root of 1640855049 is about 1179.4786188917.

The spelling of 1640855049 in words is "one billion, six hundred forty million, eight hundred fifty-five thousand, forty-nine".