1221429 has 8 divisors (see below), whose sum is σ = 1776672. Its totient is φ = 740240.

The previous prime is 1221427. The next prime is 1221443. The reversal of 1221429 is 9241221.

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 1221429 - 2¹ = 1221427 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221421) 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, 18474 + ... + 18539.

It is an arithmetic number, because the mean of its divisors is an integer number (222084).

2^1221429 is an apocalyptic number.

It is an amenable number.

1221429 is a deficient number, since it is larger than the sum of its proper divisors (555243).

1221429 is a wasteful number, since it uses less digits than its factorization.

1221429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37027.

The product of its digits is 288, while the sum is 21.

The square root of 1221429 is about 1105.1827903112. The cubic root of 1221429 is about 106.8946761078.

It can be divided in two parts, 122 and 1429, that added together give a palindrome (1551).

The spelling of 1221429 in words is "one million, two hundred twenty-one thousand, four hundred twenty-nine".