1866738740 has 24 divisors (see below), whose sum is σ = 3921257760. Its totient is φ = 746484768.

The previous prime is 1866738739. The next prime is 1866738743. The reversal of 1866738740 is 478376681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866738743) 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, 73319 + ... + 95441.

It is an arithmetic number, because the mean of its divisors is an integer number (163385740).

Almost surely, 2^1866738740 is an apocalyptic number.

1866738740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866738740 is an abundant number, since it is smaller than the sum of its proper divisors (2054519020).

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

1866738740 is a wasteful number, since it uses less digits than its factorization.

1866738740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26351 (or 26349 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 50.

The square root of 1866738740 is about 43205.7720680929. The cubic root of 1866738740 is about 1231.2923469163.

The spelling of 1866738740 in words is "one billion, eight hundred sixty-six million, seven hundred thirty-eight thousand, seven hundred forty".