1856890040 has 16 divisors (see below), whose sum is σ = 4178002680. Its totient is φ = 742756000.

The previous prime is 1856889953. The next prime is 1856890043. The reversal of 1856890040 is 400986581.

It is a self number, because there is not a number n which added to its sum of digits gives 1856890040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856890043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23211086 + ... + 23211165.

Almost surely, 2^1856890040 is an apocalyptic number.

1856890040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1856890040 is an abundant number, since it is smaller than the sum of its proper divisors (2321112640).

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

1856890040 is a wasteful number, since it uses less digits than its factorization.

1856890040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46422262 (or 46422258 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 1856890040 is about 43091.6469863940. The cubic root of 1856890040 is about 1229.1231417599.

The spelling of 1856890040 in words is "one billion, eight hundred fifty-six million, eight hundred ninety thousand, forty".