399866827500 has 1440 divisors, whose sum is σ = 1623830208000. Its totient is φ = 85730400000.

The previous prime is 399866827463. The next prime is 399866827537. The reversal of 399866827500 is 5728668993.

399866827500 is a `hidden beast` number, since 39 + 98 + 6 + 6 + 8 + 2 + 7 + 500 = 666.

It is an interprime number because it is at equal distance from previous prime (399866827463) and next prime (399866827537).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 3959077450 + ... + 3959077550.

Almost surely, 2^399866827500 is an apocalyptic number.

399866827500 is a gapful number since it is divisible by the number (30) 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 399866827500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (811915104000).

399866827500 is an abundant number, since it is smaller than the sum of its proper divisors (1223963380500).

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

399866827500 is a wasteful number, since it uses less digits than its factorization.

399866827500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 399866827500 in words is "three hundred ninety-nine billion, eight hundred sixty-six million, eight hundred twenty-seven thousand, five hundred".