1213997 has 4 divisors (see below), whose sum is σ = 1218780. Its totient is φ = 1209216.

The previous prime is 1213981. The next prime is 1214011. The reversal of 1213997 is 7993121.

It is a happy number.

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 23716 + 1190281 = 154^2 + 1091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213997 - 2⁴ = 1213981 is a prime.

It is a super-3 number, since 3×1213997³ = 5367525239606333919, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213907) 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, 1988 + ... + 2525.

It is an arithmetic number, because the mean of its divisors is an integer number (304695).

2^1213997 is an apocalyptic number.

It is an amenable number.

1213997 is a deficient number, since it is larger than the sum of its proper divisors (4783).

1213997 is an equidigital number, since it uses as much as digits as its factorization.

1213997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782.

The product of its digits is 3402, while the sum is 32.

The square root of 1213997 is about 1101.8153202783. The cubic root of 1213997 is about 106.6774283847.

The spelling of 1213997 in words is "one million, two hundred thirteen thousand, nine hundred ninety-seven".