1399821 has 8 divisors (see below), whose sum is σ = 1917024. Its totient is φ = 907920.

The previous prime is 1399819. The next prime is 1399837. The reversal of 1399821 is 1289931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1399821 - 2¹ = 1399819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6195 + ... + 6416.

It is an arithmetic number, because the mean of its divisors is an integer number (239628).

2^1399821 is an apocalyptic number.

It is an amenable number.

1399821 is a deficient number, since it is larger than the sum of its proper divisors (517203).

1399821 is a wasteful number, since it uses less digits than its factorization.

1399821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12651.

The product of its digits is 3888, while the sum is 33.

The square root of 1399821 is about 1183.1403128962. The cubic root of 1399821 is about 111.8641262592.

The spelling of 1399821 in words is "one million, three hundred ninety-nine thousand, eight hundred twenty-one".