1861878040 has 32 divisors (see below), whose sum is σ = 4570065360. Its totient is φ = 677046400.

The previous prime is 1861877989. The next prime is 1861878049. The reversal of 1861878040 is 408781681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861878049) 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, 2115331 + ... + 2116210.

Almost surely, 2^1861878040 is an apocalyptic number.

1861878040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1861878040 is an abundant number, since it is smaller than the sum of its proper divisors (2708187320).

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

1861878040 is a wasteful number, since it uses less digits than its factorization.

1861878040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231563 (or 4231559 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 1861878040 is about 43149.4848173185. The cubic root of 1861878040 is about 1230.2227194902. Note that the first 3 decimals are identical.

The spelling of 1861878040 in words is "one billion, eight hundred sixty-one million, eight hundred seventy-eight thousand, forty".