1800136685 has 16 divisors (see below), whose sum is σ = 2178074880. Its totient is φ = 1428201600.

The previous prime is 1800136673. The next prime is 1800136697. The reversal of 1800136685 is 5866310081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1800136673) and next prime (1800136697).

It is not a de Polignac number, because 1800136685 - 2²² = 1795942381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559361 + ... + 562569.

It is an arithmetic number, because the mean of its divisors is an integer number (136129680).

Almost surely, 2^1800136685 is an apocalyptic number.

It is an amenable number.

1800136685 is a deficient number, since it is larger than the sum of its proper divisors (377938195).

1800136685 is a wasteful number, since it uses less digits than its factorization.

1800136685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 1800136685 is about 42428.0176887867. The cubic root of 1800136685 is about 1216.4711889198.

The spelling of 1800136685 in words is "one billion, eight hundred million, one hundred thirty-six thousand, six hundred eighty-five".