22406381 has 2 divisors, whose sum is σ = 22406382. Its totient is φ = 22406380.

The previous prime is 22406369. The next prime is 22406387. The reversal of 22406381 is 18360422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16883881 + 5522500 = 4109^2 + 2350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22406381 is a prime.

It is a super-2 number, since 2×22406381² = 1004091819034322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22406381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22406387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11203190 + 11203191.

It is an arithmetic number, because the mean of its divisors is an integer number (11203191).

Almost surely, 2^22406381 is an apocalyptic number.

It is an amenable number.

22406381 is a deficient number, since it is larger than the sum of its proper divisors (1).

22406381 is an equidigital number, since it uses as much as digits as its factorization.

22406381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 22406381 is about 4733.5378946408. The cubic root of 22406381 is about 281.9187138920.

The spelling of 22406381 in words is "twenty-two million, four hundred six thousand, three hundred eighty-one".