1866149376 has 320 divisors, whose sum is σ = 6232934400. Its totient is φ = 485941248.

The previous prime is 1866149357. The next prime is 1866149407. The reversal of 1866149376 is 6739416681.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23622105 + ... + 23622183.

It is an arithmetic number, because the mean of its divisors is an integer number (19477920).

Almost surely, 2^1866149376 is an apocalyptic number.

1866149376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866149376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3116467200).

1866149376 is an abundant number, since it is smaller than the sum of its proper divisors (4366785024).

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

1866149376 is an frugal number, since it uses more digits than its factorization.

1866149376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 104 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The square root of 1866149376 is about 43198.9510983774. The cubic root of 1866149376 is about 1231.1627526761.

The spelling of 1866149376 in words is "one billion, eight hundred sixty-six million, one hundred forty-nine thousand, three hundred seventy-six".