1222639 has 4 divisors (see below), whose sum is σ = 1333800. Its totient is φ = 1111480.

The previous prime is 1222633. The next prime is 1222643. The reversal of 1222639 is 9362221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222639 - 2¹¹ = 1220591 is a prime.

It is a super-2 number, since 2×1222639² = 2989692248642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55564 + ... + 55585.

It is an arithmetic number, because the mean of its divisors is an integer number (333450).

2^1222639 is an apocalyptic number.

1222639 is a deficient number, since it is larger than the sum of its proper divisors (111161).

1222639 is a wasteful number, since it uses less digits than its factorization.

1222639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111160.

The product of its digits is 1296, while the sum is 25.

The square root of 1222639 is about 1105.7300755609. The cubic root of 1222639 is about 106.9299626099.

The spelling of 1222639 in words is "one million, two hundred twenty-two thousand, six hundred thirty-nine".