1225779447 has 8 divisors (see below), whose sum is σ = 1649367280. Its totient is φ = 809688960.

The previous prime is 1225779437. The next prime is 1225779461. The reversal of 1225779447 is 7449775221.

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

It is not a de Polignac number, because 1225779447 - 2⁶ = 1225779383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225779396 and 1225779405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225779437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1873954 + ... + 1874607.

It is an arithmetic number, because the mean of its divisors is an integer number (206170910).

Almost surely, 2^1225779447 is an apocalyptic number.

1225779447 is a deficient number, since it is larger than the sum of its proper divisors (423587833).

1225779447 is a wasteful number, since it uses less digits than its factorization.

1225779447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748673.

The product of its digits is 987840, while the sum is 48.

The square root of 1225779447 is about 35011.1331864594. The cubic root of 1225779447 is about 1070.2143708257.

The spelling of 1225779447 in words is "one billion, two hundred twenty-five million, seven hundred seventy-nine thousand, four hundred forty-seven".