722428381 has 2 divisors, whose sum is σ = 722428382. Its totient is φ = 722428380.

The previous prime is 722428373. The next prime is 722428403. The reversal of 722428381 is 183824227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484220025 + 238208356 = 22005^2 + 15434^2 .

It is a cyclic number.

It is not a de Polignac number, because 722428381 - 2³ = 722428373 is a prime.

It is a super-2 number, since 2×722428381² = 1043805531348562322, 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 722428381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722428351) 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, 361214190 + 361214191.

It is an arithmetic number, because the mean of its divisors is an integer number (361214191).

Almost surely, 2^722428381 is an apocalyptic number.

It is an amenable number.

722428381 is a deficient number, since it is larger than the sum of its proper divisors (1).

722428381 is an equidigital number, since it uses as much as digits as its factorization.

722428381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 722428381 is about 26878.0278480397. The cubic root of 722428381 is about 897.2874628570.

The spelling of 722428381 in words is "seven hundred twenty-two million, four hundred twenty-eight thousand, three hundred eighty-one".