22381816 has 8 divisors (see below), whose sum is σ = 41965920. Its totient is φ = 11190904.

The previous prime is 22381813. The next prime is 22381817. The reversal of 22381816 is 61818322.

22381816 is nontrivially palindromic in base 14.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22381813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1398856 + ... + 1398871.

It is an arithmetic number, because the mean of its divisors is an integer number (5245740).

Almost surely, 2^22381816 is an apocalyptic number.

It is an amenable number.

22381816 is a deficient number, since it is larger than the sum of its proper divisors (19584104).

22381816 is a wasteful number, since it uses less digits than its factorization.

22381816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797733 (or 2797729 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 22381816 is about 4730.9424008331. The cubic root of 22381816 is about 281.8156500135.

The spelling of 22381816 in words is "twenty-two million, three hundred eighty-one thousand, eight hundred sixteen".