1221459 has 4 divisors (see below), whose sum is σ = 1628616. Its totient is φ = 814304.

The previous prime is 1221457. The next prime is 1221463. The reversal of 1221459 is 9541221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9541221 = 3 ⋅3180407.

It is a cyclic number.

It is not a de Polignac number, because 1221459 - 2¹ = 1221457 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1221457) 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, 203574 + ... + 203579.

It is an arithmetic number, because the mean of its divisors is an integer number (407154).

2^1221459 is an apocalyptic number.

1221459 is a deficient number, since it is larger than the sum of its proper divisors (407157).

1221459 is an equidigital number, since it uses as much as digits as its factorization.

1221459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407156.

The product of its digits is 720, while the sum is 24.

The square root of 1221459 is about 1105.1963626433. The cubic root of 1221459 is about 106.8955512615.

The spelling of 1221459 in words is "one million, two hundred twenty-one thousand, four hundred fifty-nine".