1213387 has 6 divisors (see below), whose sum is σ = 1411548. Its totient is φ = 1040004.

The previous prime is 1213379. The next prime is 1213427. The reversal of 1213387 is 7833121.

It is not a de Polignac number, because 1213387 - 2³ = 1213379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12333 + ... + 12430.

It is an arithmetic number, because the mean of its divisors is an integer number (235258).

2^1213387 is an apocalyptic number.

1213387 is a deficient number, since it is larger than the sum of its proper divisors (198161).

1213387 is an equidigital number, since it uses as much as digits as its factorization.

1213387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24777 (or 24770 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 1213387 is about 1101.5384695960. The cubic root of 1213387 is about 106.6595579030.

It can be divided in two parts, 1213 and 387, that added together give a square (1600 = 40²).

The spelling of 1213387 in words is "one million, two hundred thirteen thousand, three hundred eighty-seven".