1868043690 has 24 divisors (see below), whose sum is σ = 4856913828. Its totient is φ = 498144960.

The previous prime is 1868043689. The next prime is 1868043701. The reversal of 1868043690 is 963408681.

It can be written as a sum of positive squares in 2 ways, for example, as 1850978529 + 17065161 = 43023^2 + 4131^2 .

It is a super-2 number, since 2×1868043690² = 6979174455497632200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10377931 + ... + 10378110.

Almost surely, 2^1868043690 is an apocalyptic number.

1868043690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1868043690 is an abundant number, since it is smaller than the sum of its proper divisors (2988870138).

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

1868043690 is a wasteful number, since it uses less digits than its factorization.

1868043690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20756054 (or 20756051 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1868043690 is about 43220.8710000157. The cubic root of 1868043690 is about 1231.5791931064.

The spelling of 1868043690 in words is "one billion, eight hundred sixty-eight million, forty-three thousand, six hundred ninety".