398645955 has 60 divisors (see below), whose sum is σ = 735467040. Its totient is φ = 206577216.

The previous prime is 398645953. The next prime is 398645987. The reversal of 398645955 is 559546893.

It is a happy number.

It is not a de Polignac number, because 398645955 - 2¹ = 398645953 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

Its product of digits (5832000) is a multiple of the sum of its prime factors (810).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398645953) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 554086 + ... + 554804.

It is an arithmetic number, because the mean of its divisors is an integer number (12257784).

Almost surely, 2^398645955 is an apocalyptic number.

398645955 is a deficient number, since it is larger than the sum of its proper divisors (336821085).

398645955 is an equidigital number, since it uses as much as digits as its factorization.

398645955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 764 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 54.

The square root of 398645955 is about 19966.1201789431. The cubic root of 398645955 is about 735.9739691044.

The spelling of 398645955 in words is "three hundred ninety-eight million, six hundred forty-five thousand, nine hundred fifty-five".