1221407 has 8 divisors (see below), whose sum is σ = 1368912. Its totient is φ = 1080000.

The previous prime is 1221391. The next prime is 1221421. The reversal of 1221407 is 7041221.

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 1221407 - 2⁴ = 1221391 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 (1221427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094 + ... + 1907.

It is an arithmetic number, because the mean of its divisors is an integer number (171114).

2^1221407 is an apocalyptic number.

1221407 is a deficient number, since it is larger than the sum of its proper divisors (147505).

1221407 is a wasteful number, since it uses less digits than its factorization.

1221407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 1221407 is about 1105.1728371617. The cubic root of 1221407 is about 106.8940343194.

Adding to 1221407 its reverse (7041221), we get a palindrome (8262628).

The spelling of 1221407 in words is "one million, two hundred twenty-one thousand, four hundred seven".