1226720025 has 48 divisors (see below), whose sum is σ = 2270896320. Its totient is φ = 649209600.

The previous prime is 1226720023. The next prime is 1226720059. The reversal of 1226720025 is 5200276221.

It is not a de Polignac number, because 1226720025 - 2¹ = 1226720023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1226720023) 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 47 ways as a sum of consecutive naturals, for example, 81489 + ... + 95361.

It is an arithmetic number, because the mean of its divisors is an integer number (47310340).

Almost surely, 2^1226720025 is an apocalyptic number.

1226720025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1226720025 is a deficient number, since it is larger than the sum of its proper divisors (1044176295).

1226720025 is a wasteful number, since it uses less digits than its factorization.

1226720025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14023 (or 14012 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1226720025 is about 35024.5631664408. The cubic root of 1226720025 is about 1070.4880368958.

Adding to 1226720025 its reverse (5200276221), we get a palindrome (6426996246).

The spelling of 1226720025 in words is "one billion, two hundred twenty-six million, seven hundred twenty thousand, twenty-five".