399284988240 has 160 divisors (see below), whose sum is σ = 1291905884160. Its totient is φ = 101822499328.

The previous prime is 399284988227. The next prime is 399284988307. The reversal of 399284988240 is 42889482993.

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, 41853391 + ... + 41862929.

It is an arithmetic number, because the mean of its divisors is an integer number (8074411776).

Almost surely, 2^399284988240 is an apocalyptic number.

399284988240 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 399284988240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645952942080).

399284988240 is an abundant number, since it is smaller than the sum of its proper divisors (892620895920).

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

399284988240 is a wasteful number, since it uses less digits than its factorization.

399284988240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17161 (or 17155 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 66.

The spelling of 399284988240 in words is "three hundred ninety-nine billion, two hundred eighty-four million, nine hundred eighty-eight thousand, two hundred forty".