398866001 has 4 divisors (see below), whose sum is σ = 404483904. Its totient is φ = 393248100.

The previous prime is 398865991. The next prime is 398866003. The reversal of 398866001 is 100668893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398866001 - 2¹⁸ = 398603857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398866001.

It is not an unprimeable number, because it can be changed into a prime (398866003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2808845 + ... + 2808986.

It is an arithmetic number, because the mean of its divisors is an integer number (101120976).

Almost surely, 2^398866001 is an apocalyptic number.

It is an amenable number.

398866001 is a deficient number, since it is larger than the sum of its proper divisors (5617903).

398866001 is an equidigital number, since it uses as much as digits as its factorization.

398866001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5617902.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 398866001 is about 19971.6299034405. The cubic root of 398866001 is about 736.1093593653.

The spelling of 398866001 in words is "three hundred ninety-eight million, eight hundred sixty-six thousand, one".