1143397 has 4 divisors (see below), whose sum is σ = 1148620. Its totient is φ = 1138176.

The previous prime is 1143391. The next prime is 1143407. The reversal of 1143397 is 7933411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 367236 = 881^2 + 606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143397 - 2⁷ = 1143269 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 (1143391) 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, 2268 + ... + 2725.

It is an arithmetic number, because the mean of its divisors is an integer number (287155).

2^1143397 is an apocalyptic number.

It is an amenable number.

1143397 is a deficient number, since it is larger than the sum of its proper divisors (5223).

1143397 is an equidigital number, since it uses as much as digits as its factorization.

1143397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5222.

The product of its digits is 2268, while the sum is 28.

The square root of 1143397 is about 1069.2974328969. The cubic root of 1143397 is about 104.5680516428.

It can be divided in two parts, 1143 and 397, that added together give a triangular number (1540 = T₅₅).

The spelling of 1143397 in words is "one million, one hundred forty-three thousand, three hundred ninety-seven".