22149865 has 16 divisors (see below), whose sum is σ = 27721152. Its totient is φ = 16974144.

The previous prime is 22149833. The next prime is 22149871. The reversal of 22149865 is 56894122.

It is a cyclic number.

It is not a de Polignac number, because 22149865 - 2⁵ = 22149833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11502 + ... + 13288.

It is an arithmetic number, because the mean of its divisors is an integer number (1732572).

Almost surely, 2^22149865 is an apocalyptic number.

It is an amenable number.

22149865 is a deficient number, since it is larger than the sum of its proper divisors (5571287).

22149865 is a wasteful number, since it uses less digits than its factorization.

22149865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896.

The product of its digits is 34560, while the sum is 37.

The square root of 22149865 is about 4706.3643080408. The cubic root of 22149865 is about 280.8387477542.

It can be divided in two parts, 221 and 49865, that added together give a triangular number (50086 = T₃₁₆).

The spelling of 22149865 in words is "twenty-two million, one hundred forty-nine thousand, eight hundred sixty-five".