1812587640 has 32 divisors (see below), whose sum is σ = 5437763280. Its totient is φ = 483356672.

The previous prime is 1812587633. The next prime is 1812587641. The reversal of 1812587640 is 467852181.

It is a junction number, because it is equal to n+sod(n) for n = 1812587592 and 1812587601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812587641) 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, 7552329 + ... + 7552568.

Almost surely, 2^1812587640 is an apocalyptic number.

1812587640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812587640 is an abundant number, since it is smaller than the sum of its proper divisors (3625175640).

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

1812587640 is a wasteful number, since it uses less digits than its factorization.

1812587640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15104911 (or 15104907 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 1812587640 is about 42574.4951819749. The cubic root of 1812587640 is about 1219.2693914545.

The spelling of 1812587640 in words is "one billion, eight hundred twelve million, five hundred eighty-seven thousand, six hundred forty".