1225208839 has 4 divisors (see below), whose sum is σ = 1228441960. Its totient is φ = 1221975720.

The previous prime is 1225208837. The next prime is 1225208869. The reversal of 1225208839 is 9388025221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1225208839 - 2¹ = 1225208837 is a prime.

It is a super-2 number, since 2×1225208839² = 3002273398327455842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225208837) 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, 1615992 + ... + 1616749.

It is an arithmetic number, because the mean of its divisors is an integer number (307110490).

Almost surely, 2^1225208839 is an apocalyptic number.

1225208839 is a deficient number, since it is larger than the sum of its proper divisors (3233121).

1225208839 is an equidigital number, since it uses as much as digits as its factorization.

1225208839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233120.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1225208839 is about 35002.9832871428. The cubic root of 1225208839 is about 1070.0482812231.

The spelling of 1225208839 in words is "one billion, two hundred twenty-five million, two hundred eight thousand, eight hundred thirty-nine".