421644037 has 2 divisors, whose sum is σ = 421644038. Its totient is φ = 421644036.

The previous prime is 421644011. The next prime is 421644071. The reversal of 421644037 is 730446124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419471361 + 2172676 = 20481^2 + 1474^2 .

It is a cyclic number.

It is not a de Polignac number, because 421644037 - 2¹¹ = 421641989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421644007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210822018 + 210822019.

It is an arithmetic number, because the mean of its divisors is an integer number (210822019).

Almost surely, 2^421644037 is an apocalyptic number.

It is an amenable number.

421644037 is a deficient number, since it is larger than the sum of its proper divisors (1).

421644037 is an equidigital number, since it uses as much as digits as its factorization.

421644037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 421644037 is about 20533.9727524900. The cubic root of 421644037 is about 749.8631080527.

The spelling of 421644037 in words is "four hundred twenty-one million, six hundred forty-four thousand, thirty-seven".