421400237 has 2 divisors, whose sum is σ = 421400238. Its totient is φ = 421400236.

The previous prime is 421400219. The next prime is 421400249. The reversal of 421400237 is 732004124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417344041 + 4056196 = 20429^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 421400237 - 2¹⁶ = 421334701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421400207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210700118 + 210700119.

It is an arithmetic number, because the mean of its divisors is an integer number (210700119).

Almost surely, 2^421400237 is an apocalyptic number.

It is an amenable number.

421400237 is a deficient number, since it is larger than the sum of its proper divisors (1).

421400237 is an equidigital number, since it uses as much as digits as its factorization.

421400237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 421400237 is about 20528.0353906554. The cubic root of 421400237 is about 749.7185533599.

The spelling of 421400237 in words is "four hundred twenty-one million, four hundred thousand, two hundred thirty-seven".