865155490 has 8 divisors (see below), whose sum is σ = 1557279900. Its totient is φ = 346062192.

The previous prime is 865155479. The next prime is 865155539. The reversal of 865155490 is 94551568.

It can be written as a sum of positive squares in 2 ways, for example, as 714332529 + 150822961 = 26727^2 + 12281^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43257765 + ... + 43257784.

Almost surely, 2^865155490 is an apocalyptic number.

865155490 is a deficient number, since it is larger than the sum of its proper divisors (692124410).

865155490 is a wasteful number, since it uses less digits than its factorization.

865155490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86515556.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 865155490 is about 29413.5256302266. The cubic root of 865155490 is about 952.8650314048.

The spelling of 865155490 in words is "eight hundred sixty-five million, one hundred fifty-five thousand, four hundred ninety".