808687949 has 4 divisors (see below), whose sum is σ = 812878236. Its totient is φ = 804497664.

The previous prime is 808687921. The next prime is 808687951. The reversal of 808687949 is 949786808.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 444450724 + 364237225 = 21082^2 + 19085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-808687949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808687249) 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, 2094854 + ... + 2095239.

It is an arithmetic number, because the mean of its divisors is an integer number (203219559).

Almost surely, 2^808687949 is an apocalyptic number.

It is an amenable number.

808687949 is a deficient number, since it is larger than the sum of its proper divisors (4190287).

808687949 is a wasteful number, since it uses less digits than its factorization.

808687949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4190286.

The product of its (nonzero) digits is 6967296, while the sum is 59.

The square root of 808687949 is about 28437.4392131218. The cubic root of 808687949 is about 931.6661652741. Note that the first 3 decimals are identical.

The spelling of 808687949 in words is "eight hundred eight million, six hundred eighty-seven thousand, nine hundred forty-nine".