1225736839 has 4 divisors (see below), whose sum is σ = 1297839024. Its totient is φ = 1153634656.

The previous prime is 1225736821. The next prime is 1225736849. The reversal of 1225736839 is 9386375221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9386375221 = 41 ⋅228935981.

It is a cyclic number.

It is not a de Polignac number, because 1225736839 - 2⁷ = 1225736711 is a prime.

It is a super-3 number, since 3×1225736839³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225736849) 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, 36051067 + ... + 36051100.

It is an arithmetic number, because the mean of its divisors is an integer number (324459756).

Almost surely, 2^1225736839 is an apocalyptic number.

1225736839 is a deficient number, since it is larger than the sum of its proper divisors (72102185).

1225736839 is an equidigital number, since it uses as much as digits as its factorization.

1225736839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72102184.

The product of its digits is 544320, while the sum is 46.

The square root of 1225736839 is about 35010.5246890132. The cubic root of 1225736839 is about 1070.2019704921.

The spelling of 1225736839 in words is "one billion, two hundred twenty-five million, seven hundred thirty-six thousand, eight hundred thirty-nine".