398475420 has 96 divisors (see below), whose sum is σ = 1283455488. Its totient is φ = 90484992.

The previous prime is 398475409. The next prime is 398475443. The reversal of 398475420 is 24574893.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62919 + ... + 68961.

It is an arithmetic number, because the mean of its divisors is an integer number (13369328).

Almost surely, 2^398475420 is an apocalyptic number.

398475420 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 398475420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (641727744).

398475420 is an abundant number, since it is smaller than the sum of its proper divisors (884980068).

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

398475420 is a wasteful number, since it uses less digits than its factorization.

398475420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6219 (or 6217 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 398475420 is about 19961.8491127450. The cubic root of 398475420 is about 735.8690077800.

The spelling of 398475420 in words is "three hundred ninety-eight million, four hundred seventy-five thousand, four hundred twenty".