401442187 has 2 divisors, whose sum is σ = 401442188. Its totient is φ = 401442186.

The previous prime is 401442137. The next prime is 401442211. The reversal of 401442187 is 781244104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401442187 - 2¹⁵ = 401409419 is a prime.

It is a super-2 number, since 2×401442187² = 322311659006685938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401442137) 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, 200721093 + 200721094.

It is an arithmetic number, because the mean of its divisors is an integer number (200721094).

Almost surely, 2^401442187 is an apocalyptic number.

401442187 is a deficient number, since it is larger than the sum of its proper divisors (1).

401442187 is an equidigital number, since it uses as much as digits as its factorization.

401442187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 401442187 is about 20036.0222349647. The cubic root of 401442187 is about 737.6907480175.

The spelling of 401442187 in words is "four hundred one million, four hundred forty-two thousand, one hundred eighty-seven".