398793780 has 480 divisors, whose sum is σ = 1639249920. Its totient is φ = 78693120.

The previous prime is 398793779. The next prime is 398793833. The reversal of 398793780 is 87397893.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2868951 + ... + 2869089.

It is an arithmetic number, because the mean of its divisors is an integer number (3415104).

Almost surely, 2^398793780 is an apocalyptic number.

398793780 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 398793780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819624960).

398793780 is an abundant number, since it is smaller than the sum of its proper divisors (1240456140).

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

398793780 is a wasteful number, since it uses less digits than its factorization.

398793780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 398793780 is about 19969.8217318032. The cubic root of 398793780 is about 736.0649286017.

The spelling of 398793780 in words is "three hundred ninety-eight million, seven hundred ninety-three thousand, seven hundred eighty".