398172446 has 12 divisors (see below), whose sum is σ = 682709352. Its totient is φ = 170613336.

The previous prime is 398172427. The next prime is 398172479. The reversal of 398172446 is 644271893.

It is a junction number, because it is equal to n+sod(n) for n = 398172397 and 398172406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71996 + ... + 77328.

It is an arithmetic number, because the mean of its divisors is an integer number (56892446).

Almost surely, 2^398172446 is an apocalyptic number.

398172446 is a deficient number, since it is larger than the sum of its proper divisors (284536906).

398172446 is an frugal number, since it uses more digits than its factorization.

398172446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10675 (or 5342 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 398172446 is about 19954.2588436654. The cubic root of 398172446 is about 735.6824586692.

Multiplying 398172446 by its product of digits (290304), we get a square (115591053763584 = 10751328²).

The spelling of 398172446 in words is "three hundred ninety-eight million, one hundred seventy-two thousand, four hundred forty-six".