1022399 has 4 divisors (see below), whose sum is σ = 1168464. Its totient is φ = 876336.

The previous prime is 1022389. The next prime is 1022429. The reversal of 1022399 is 9932201.

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 1022399 - 2⁴ = 1022383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022389) 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, 73022 + ... + 73035.

It is an arithmetic number, because the mean of its divisors is an integer number (292116).

2^1022399 is an apocalyptic number.

1022399 is a deficient number, since it is larger than the sum of its proper divisors (146065).

1022399 is an equidigital number, since it uses as much as digits as its factorization.

1022399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146064.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1022399 is about 1011.1374782887. The cubic root of 1022399 is about 100.7411270707.

The spelling of 1022399 in words is "one million, twenty-two thousand, three hundred ninety-nine".