401215189 has 2 divisors, whose sum is σ = 401215190. Its totient is φ = 401215188.

The previous prime is 401215159. The next prime is 401215231. The reversal of 401215189 is 981512104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202123089 + 199092100 = 14217^2 + 14110^2 .

It is a cyclic number.

It is not a de Polignac number, because 401215189 - 2⁹ = 401214677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401215189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401215159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200607594 + 200607595.

It is an arithmetic number, because the mean of its divisors is an integer number (200607595).

Almost surely, 2^401215189 is an apocalyptic number.

It is an amenable number.

401215189 is a deficient number, since it is larger than the sum of its proper divisors (1).

401215189 is an equidigital number, since it uses as much as digits as its factorization.

401215189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 401215189 is about 20030.3566867892. The cubic root of 401215189 is about 737.5516778496.

The spelling of 401215189 in words is "four hundred one million, two hundred fifteen thousand, one hundred eighty-nine".