1221430 has 16 divisors (see below), whose sum is σ = 2512800. Its totient is φ = 418752.

The previous prime is 1221427. The next prime is 1221443. The reversal of 1221430 is 341221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8655 + ... + 8794.

It is an arithmetic number, because the mean of its divisors is an integer number (157050).

2^1221430 is an apocalyptic number.

1221430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221430 is an abundant number, since it is smaller than the sum of its proper divisors (1291370).

1221430 is a wasteful number, since it uses less digits than its factorization.

1221430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17463.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1221430 is about 1105.1832427249. The cubic root of 1221430 is about 106.8947052799.

Adding to 1221430 its reverse (341221), we get a palindrome (1562651).

The spelling of 1221430 in words is "one million, two hundred twenty-one thousand, four hundred thirty".