401605189 has 4 divisors (see below), whose sum is σ = 405581580. Its totient is φ = 397628800.

The previous prime is 401605157. The next prime is 401605199. The reversal of 401605189 is 981506104.

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 369908289 + 31696900 = 19233^2 + 5630^2 .

It is a cyclic number.

It is not a de Polignac number, because 401605189 - 2⁵ = 401605157 is a prime.

It is a super-2 number, since 2×401605189² = 322573455663451442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401605129) 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, 1988044 + ... + 1988245.

It is an arithmetic number, because the mean of its divisors is an integer number (101395395).

Almost surely, 2^401605189 is an apocalyptic number.

It is an amenable number.

401605189 is a deficient number, since it is larger than the sum of its proper divisors (3976391).

401605189 is a wasteful number, since it uses less digits than its factorization.

401605189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976390.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 401605189 is about 20040.0895457081. The cubic root of 401605189 is about 737.7905787445.

The spelling of 401605189 in words is "four hundred one million, six hundred five thousand, one hundred eighty-nine".