421246139 has 2 divisors, whose sum is σ = 421246140. Its totient is φ = 421246138.

The previous prime is 421246129. The next prime is 421246193. The reversal of 421246139 is 931642124.

Together with next prime (421246193) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421246139 - 2⁸ = 421245883 is a prime.

It is not a weakly prime, because it can be changed into another prime (421246109) 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, 210623069 + 210623070.

It is an arithmetic number, because the mean of its divisors is an integer number (210623070).

Almost surely, 2^421246139 is an apocalyptic number.

421246139 is a deficient number, since it is larger than the sum of its proper divisors (1).

421246139 is an equidigital number, since it uses as much as digits as its factorization.

421246139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 421246139 is about 20524.2816926683. The cubic root of 421246139 is about 749.6271563105.

The spelling of 421246139 in words is "four hundred twenty-one million, two hundred forty-six thousand, one hundred thirty-nine".