1222399 has 4 divisors (see below), whose sum is σ = 1224720. Its totient is φ = 1220080.

The previous prime is 1222393. The next prime is 1222409. The reversal of 1222399 is 9932221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9932221 = 13 ⋅764017.

It is a cyclic number.

It is not a de Polignac number, because 1222399 - 2⁷ = 1222271 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222393) 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, 54 + ... + 1564.

It is an arithmetic number, because the mean of its divisors is an integer number (306180).

2^1222399 is an apocalyptic number.

1222399 is a deficient number, since it is larger than the sum of its proper divisors (2321).

1222399 is an equidigital number, since it uses as much as digits as its factorization.

1222399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320.

The product of its digits is 1944, while the sum is 28.

The square root of 1222399 is about 1105.6215446526. The cubic root of 1222399 is about 106.9229654858.

It can be divided in two parts, 1222 and 399, that multiplied together give a triangular number (487578 = T₉₈₇).

The spelling of 1222399 in words is "one million, two hundred twenty-two thousand, three hundred ninety-nine".