1221492839 has 8 divisors (see below), whose sum is σ = 1396226208. Its totient is φ = 1046818080.

The previous prime is 1221492817. The next prime is 1221492859. The reversal of 1221492839 is 9382941221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221492839 - 2¹⁶ = 1221427303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221492796 and 1221492805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221492859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47729 + ... + 68709.

It is an arithmetic number, because the mean of its divisors is an integer number (174528276).

Almost surely, 2^1221492839 is an apocalyptic number.

1221492839 is a deficient number, since it is larger than the sum of its proper divisors (174733369).

1221492839 is an equidigital number, since it uses as much as digits as its factorization.

1221492839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29305.

The product of its digits is 62208, while the sum is 41.

The square root of 1221492839 is about 34949.8617879957. The cubic root of 1221492839 is about 1068.9653838838.

The spelling of 1221492839 in words is "one billion, two hundred twenty-one million, four hundred ninety-two thousand, eight hundred thirty-nine".