398445240 has 32 divisors (see below), whose sum is σ = 1195336080. Its totient is φ = 106252032.

The previous prime is 398445211. The next prime is 398445247. The reversal of 398445240 is 42544893.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398445247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1660069 + ... + 1660308.

Almost surely, 2^398445240 is an apocalyptic number.

398445240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398445240 is an abundant number, since it is smaller than the sum of its proper divisors (796890840).

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

398445240 is a wasteful number, since it uses less digits than its factorization.

398445240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320391 (or 3320387 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 398445240 is about 19961.0931564381. The cubic root of 398445240 is about 735.8504293967.

The spelling of 398445240 in words is "three hundred ninety-eight million, four hundred forty-five thousand, two hundred forty".