4223640437 has 18 divisors (see below), whose sum is σ = 4397405922. Its totient is φ = 4055286144.

The previous prime is 4223640413. The next prime is 4223640481. The reversal of 4223640437 is 7340463224.

It can be written as a sum of positive squares in 3 ways, for example, as 88378801 + 4135261636 = 9401^2 + 64306^2 .

It is not a de Polignac number, because 4223640437 - 2⁶ = 4223640373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4223640397 and 4223640406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4223640137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 37377293 + ... + 37377405.

It is an arithmetic number, because the mean of its divisors is an integer number (244300329).

Almost surely, 2^4223640437 is an apocalyptic number.

It is an amenable number.

4223640437 is a deficient number, since it is larger than the sum of its proper divisors (173765485).

4223640437 is an frugal number, since it uses more digits than its factorization.

4223640437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 35.

The square root of 4223640437 is about 64989.5409816072. The cubic root of 4223640437 is about 1616.4501395109.

The spelling of 4223640437 in words is "four billion, two hundred twenty-three million, six hundred forty thousand, four hundred thirty-seven".