1228739747 has 4 divisors (see below), whose sum is σ = 1293410280. Its totient is φ = 1164069216.

The previous prime is 1228739737. The next prime is 1228739791. The reversal of 1228739747 is 7479378221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7479378221 = 7 ⋅1068482603.

It is a cyclic number.

It is not a de Polignac number, because 1228739747 - 2⁶ = 1228739683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1228739695 and 1228739704.

It is not an unprimeable number, because it can be changed into a prime (1228739717) 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, 32335238 + ... + 32335275.

It is an arithmetic number, because the mean of its divisors is an integer number (323352570).

Almost surely, 2^1228739747 is an apocalyptic number.

1228739747 is a deficient number, since it is larger than the sum of its proper divisors (64670533).

1228739747 is an equidigital number, since it uses as much as digits as its factorization.

1228739747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64670532.

The product of its digits is 1185408, while the sum is 50.

The square root of 1228739747 is about 35053.3842446061. The cubic root of 1228739747 is about 1071.0752131858.

The spelling of 1228739747 in words is "one billion, two hundred twenty-eight million, seven hundred thirty-nine thousand, seven hundred forty-seven".