398240640000 has 1980 divisors, whose sum is σ = 1791178533144. Its totient is φ = 84639744000.

The previous prime is 398240639999. The next prime is 398240640023. The reversal of 398240640000 is 46042893.

It is a happy number.

398240640000 is a `hidden beast` number, since 3 + 9 + 8 + 2 + 4 + 0 + 640 + 0 + 0 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 4798079959 + ... + 4798080041.

Almost surely, 2^398240640000 is an apocalyptic number.

398240640000 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 398240640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895589266572).

398240640000 is an abundant number, since it is smaller than the sum of its proper divisors (1392937893144).

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

398240640000 is a wasteful number, since it uses less digits than its factorization.

398240640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Adding to 398240640000 its reverse (46042893), we get a palindrome (398286682893).

The spelling of 398240640000 in words is "three hundred ninety-eight billion, two hundred forty million, six hundred forty thousand".