399797543040 has 256 divisors, whose sum is σ = 1490277381120. Its totient is φ = 89256996864.

The previous prime is 399797543039. The next prime is 399797543053. The reversal of 399797543040 is 40345797993.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 232027 + ... + 923813.

It is an arithmetic number, because the mean of its divisors is an integer number (5821396020).

Almost surely, 2^399797543040 is an apocalyptic number.

399797543040 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 399797543040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745138690560).

399797543040 is an abundant number, since it is smaller than the sum of its proper divisors (1090479838080).

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

399797543040 is a wasteful number, since it uses less digits than its factorization.

399797543040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691859 (or 691847 counting only the distinct ones).

The product of its (nonzero) digits is 25719120, while the sum is 60.

The spelling of 399797543040 in words is "three hundred ninety-nine billion, seven hundred ninety-seven million, five hundred forty-three thousand, forty".