1866212040 has 576 divisors, whose sum is σ = 7445148480. Its totient is φ = 372556800.

The previous prime is 1866212039. The next prime is 1866212071. The reversal of 1866212040 is 402126681.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1866211989 and 1866212007.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 30593610 + ... + 30593670.

It is an arithmetic number, because the mean of its divisors is an integer number (12925605).

Almost surely, 2^1866212040 is an apocalyptic number.

1866212040 is a gapful number since it is divisible by the number (10) 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 1866212040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3722574240).

1866212040 is an abundant number, since it is smaller than the sum of its proper divisors (5578936440).

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

1866212040 is a wasteful number, since it uses less digits than its factorization.

1866212040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1866212040 is about 43199.6763876768. The cubic root of 1866212040 is about 1231.1765330519.

The spelling of 1866212040 in words is "one billion, eight hundred sixty-six million, two hundred twelve thousand, forty".