398444780 has 24 divisors (see below), whose sum is σ = 844143552. Its totient is φ = 157966592.

The previous prime is 398444771. The next prime is 398444789. The reversal of 398444780 is 87444893.

It is an interprime number because it is at equal distance from previous prime (398444771) and next prime (398444789).

It is not an unprimeable number, because it can be changed into a prime (398444789) 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, 85892 + ... + 90411.

It is an arithmetic number, because the mean of its divisors is an integer number (35172648).

Almost surely, 2^398444780 is an apocalyptic number.

It is an amenable number.

398444780 is an abundant number, since it is smaller than the sum of its proper divisors (445698772).

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

398444780 is a wasteful number, since it uses less digits than its factorization.

398444780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176425 (or 176423 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The square root of 398444780 is about 19961.0816340197. The cubic root of 398444780 is about 735.8501462199.

The spelling of 398444780 in words is "three hundred ninety-eight million, four hundred forty-four thousand, seven hundred eighty".