398820145 has 8 divisors (see below), whose sum is σ = 488767104. Its totient is φ = 312267504.

The previous prime is 398820139. The next prime is 398820181. The reversal of 398820145 is 541028893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398820145 - 2¹⁷ = 398689073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398820098 and 398820107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848319 + ... + 848788.

It is an arithmetic number, because the mean of its divisors is an integer number (61095888).

Almost surely, 2^398820145 is an apocalyptic number.

It is an amenable number.

398820145 is a deficient number, since it is larger than the sum of its proper divisors (89946959).

398820145 is a wasteful number, since it uses less digits than its factorization.

398820145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697159.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 398820145 is about 19970.4818419586. The cubic root of 398820145 is about 736.0811491189.

The spelling of 398820145 in words is "three hundred ninety-eight million, eight hundred twenty thousand, one hundred forty-five".