401243189 has 2 divisors, whose sum is σ = 401243190. Its totient is φ = 401243188.

The previous prime is 401243149. The next prime is 401243209. The reversal of 401243189 is 981342104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317374225 + 83868964 = 17815^2 + 9158^2 .

It is a cyclic number.

It is not a de Polignac number, because 401243189 - 2¹⁶ = 401177653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401243149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200621594 + 200621595.

It is an arithmetic number, because the mean of its divisors is an integer number (200621595).

Almost surely, 2^401243189 is an apocalyptic number.

It is an amenable number.

401243189 is a deficient number, since it is larger than the sum of its proper divisors (1).

401243189 is an equidigital number, since it uses as much as digits as its factorization.

401243189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 401243189 is about 20031.0556137214. The cubic root of 401243189 is about 737.5688348659.

The spelling of 401243189 in words is "four hundred one million, two hundred forty-three thousand, one hundred eighty-nine".