1399221 has 16 divisors (see below), whose sum is σ = 2145600. Its totient is φ = 900144.

The previous prime is 1399213. The next prime is 1399231. The reversal of 1399221 is 1229931.

It is not a de Polignac number, because 1399221 - 2³ = 1399213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111 + ... + 1676.

It is an arithmetic number, because the mean of its divisors is an integer number (134100).

2^1399221 is an apocalyptic number.

It is an amenable number.

1399221 is a deficient number, since it is larger than the sum of its proper divisors (746379).

1399221 is a wasteful number, since it uses less digits than its factorization.

1399221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825 (or 1819 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1399221 is about 1182.8867232326. The cubic root of 1399221 is about 111.8481413422.

The spelling of 1399221 in words is "one million, three hundred ninety-nine thousand, two hundred twenty-one".