398151720 has 128 divisors (see below), whose sum is σ = 1331654400. Its totient is φ = 105815808.

The previous prime is 398151703. The next prime is 398151737. The reversal of 398151720 is 27151893.

It is an interprime number because it is at equal distance from previous prime (398151703) and next prime (398151737).

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

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, 525582 + ... + 526338.

It is an arithmetic number, because the mean of its divisors is an integer number (10403550).

Almost surely, 2^398151720 is an apocalyptic number.

398151720 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 398151720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665827200).

398151720 is an abundant number, since it is smaller than the sum of its proper divisors (933502680).

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

398151720 is a wasteful number, since it uses less digits than its factorization.

398151720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 398151720 is about 19953.7394991515. The cubic root of 398151720 is about 735.6696936647.

The spelling of 398151720 in words is "three hundred ninety-eight million, one hundred fifty-one thousand, seven hundred twenty".