1853694640 has 40 divisors (see below), whose sum is σ = 4925532960. Its totient is φ = 635552256.

The previous prime is 1853694599. The next prime is 1853694649. The reversal of 1853694640 is 464963581.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1853694649) 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, 1654525 + ... + 1655644.

It is an arithmetic number, because the mean of its divisors is an integer number (123138324).

Almost surely, 2^1853694640 is an apocalyptic number.

1853694640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1853694640 is an abundant number, since it is smaller than the sum of its proper divisors (3071838320).

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

1853694640 is a wasteful number, since it uses less digits than its factorization.

1853694640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310189 (or 3310183 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 1853694640 is about 43054.5542306502. The cubic root of 1853694640 is about 1228.4176978832.

The spelling of 1853694640 in words is "one billion, eight hundred fifty-three million, six hundred ninety-four thousand, six hundred forty".