1211399 has 8 divisors (see below), whose sum is σ = 1407648. Its totient is φ = 1020960.

The previous prime is 1211393. The next prime is 1211407. The reversal of 1211399 is 9931121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211399 - 2²⁰ = 162823 is a prime.

It is a super-3 number, since 3×1211399³ = 5333138805233262597, which contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211393) 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, 992 + ... + 1845.

It is an arithmetic number, because the mean of its divisors is an integer number (175956).

2^1211399 is an apocalyptic number.

1211399 is a deficient number, since it is larger than the sum of its proper divisors (196249).

1211399 is an equidigital number, since it uses as much as digits as its factorization.

1211399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905.

The product of its digits is 486, while the sum is 26.

The square root of 1211399 is about 1100.6357253878. The cubic root of 1211399 is about 106.6012761106.

It can be divided in two parts, 12 and 11399, that added together give a palindrome (11411).

The spelling of 1211399 in words is "one million, two hundred eleven thousand, three hundred ninety-nine".