865219490 has 32 divisors (see below), whose sum is σ = 1583038080. Its totient is φ = 340412800.

The previous prime is 865219447. The next prime is 865219493. The reversal of 865219490 is 94912568.

It is not an unprimeable number, because it can be changed into a prime (865219493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368741 + ... + 371079.

It is an arithmetic number, because the mean of its divisors is an integer number (49469940).

Almost surely, 2^865219490 is an apocalyptic number.

865219490 is a deficient number, since it is larger than the sum of its proper divisors (717818590).

865219490 is a wasteful number, since it uses less digits than its factorization.

865219490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 865219490 is about 29414.6135449711. The cubic root of 865219490 is about 952.8885269341. Note that the first 3 decimals are identical.

The spelling of 865219490 in words is "eight hundred sixty-five million, two hundred nineteen thousand, four hundred ninety".