1228739 has 4 divisors (see below), whose sum is σ = 1231056. Its totient is φ = 1226424.

The previous prime is 1228693. The next prime is 1228741. The reversal of 1228739 is 9378221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9378221 = 863 ⋅10867.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228789) 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 3 ways as a sum of consecutive naturals, for example, 77 + ... + 1569.

It is an arithmetic number, because the mean of its divisors is an integer number (307764).

2^1228739 is an apocalyptic number.

1228739 is a deficient number, since it is larger than the sum of its proper divisors (2317).

1228739 is an equidigital number, since it uses as much as digits as its factorization.

1228739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316.

The product of its digits is 6048, while the sum is 32.

The square root of 1228739 is about 1108.4850021538. The cubic root of 1228739 is about 107.1074996136.

The spelling of 1228739 in words is "one million, two hundred twenty-eight thousand, seven hundred thirty-nine".