863507749 has 8 divisors (see below), whose sum is σ = 930174840. Its totient is φ = 796875456.

The previous prime is 863507737. The next prime is 863507779. The reversal of 863507749 is 947705368.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 74909025 + 788598724 = 8655^2 + 28082^2 .

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

It is not a de Polignac number, because 863507749 - 2⁷ = 863507621 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 (863507779) 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, 67839 + ... + 79555.

It is an arithmetic number, because the mean of its divisors is an integer number (116271855).

Almost surely, 2^863507749 is an apocalyptic number.

It is an amenable number.

863507749 is a deficient number, since it is larger than the sum of its proper divisors (66667091).

863507749 is a wasteful number, since it uses less digits than its factorization.

863507749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17399.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 863507749 is about 29385.5023608582. The cubic root of 863507749 is about 952.2597172459.

The spelling of 863507749 in words is "eight hundred sixty-three million, five hundred seven thousand, seven hundred forty-nine".