398987401 has 4 divisors (see below), whose sum is σ = 399379204. Its totient is φ = 398595600.

The previous prime is 398987389. The next prime is 398987419. The reversal of 398987401 is 104789893.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154878025 + 244109376 = 12445^2 + 15624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398987401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398985401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194370 + ... + 196411.

It is an arithmetic number, because the mean of its divisors is an integer number (99844801).

Almost surely, 2^398987401 is an apocalyptic number.

It is an amenable number.

398987401 is a deficient number, since it is larger than the sum of its proper divisors (391803).

398987401 is a wasteful number, since it uses less digits than its factorization.

398987401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391802.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 398987401 is about 19974.6689834901. The cubic root of 398987401 is about 736.1840332417.

The spelling of 398987401 in words is "three hundred ninety-eight million, nine hundred eighty-seven thousand, four hundred one".