1865022090 has 16 divisors (see below), whose sum is σ = 4476053088. Its totient is φ = 497339216.

The previous prime is 1865022073. The next prime is 1865022097. The reversal of 1865022090 is 902205681.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1865022097) 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, 31083672 + ... + 31083731.

It is an arithmetic number, because the mean of its divisors is an integer number (279753318).

Almost surely, 2^1865022090 is an apocalyptic number.

1865022090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1865022090 is an abundant number, since it is smaller than the sum of its proper divisors (2611030998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1865022090 is a wasteful number, since it uses less digits than its factorization.

1865022090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62167413.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1865022090 is about 43185.9015188985. The cubic root of 1865022090 is about 1230.9147996622.

The spelling of 1865022090 in words is "one billion, eight hundred sixty-five million, twenty-two thousand, ninety".