398693724 has 192 divisors, whose sum is σ = 1178634240. Its totient is φ = 103034880.

The previous prime is 398693723. The next prime is 398693731. The reversal of 398693724 is 427396893.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398693723) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2304502 + ... + 2304674.

It is an arithmetic number, because the mean of its divisors is an integer number (6138720).

Almost surely, 2^398693724 is an apocalyptic number.

398693724 is a gapful number since it is divisible by the number (34) 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 398693724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (589317120).

398693724 is an abundant number, since it is smaller than the sum of its proper divisors (779940516).

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

398693724 is a wasteful number, since it uses less digits than its factorization.

398693724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 298 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 51.

The square root of 398693724 is about 19967.3163945484. The cubic root of 398693724 is about 736.0033647255.

The spelling of 398693724 in words is "three hundred ninety-eight million, six hundred ninety-three thousand, seven hundred twenty-four".