1861413870 has 24 divisors (see below), whose sum is σ = 4467960504. Its totient is φ = 496314016.

The previous prime is 1861413839. The next prime is 1861413877. The reversal of 1861413870 is 783141681.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861413877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232372 + ... + 240248.

It is an arithmetic number, because the mean of its divisors is an integer number (186165021).

Almost surely, 2^1861413870 is an apocalyptic number.

1861413870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1861413870 is an abundant number, since it is smaller than the sum of its proper divisors (2606546634).

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

1861413870 is an frugal number, since it uses more digits than its factorization.

1861413870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15764 (or 7887 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 1861413870 is about 43144.1058546819. The cubic root of 1861413870 is about 1230.1204786475.

The spelling of 1861413870 in words is "one billion, eight hundred sixty-one million, four hundred thirteen thousand, eight hundred seventy".