1225303440 has 40 divisors (see below), whose sum is σ = 3798441408. Its totient is φ = 326747520.

The previous prime is 1225303421. The next prime is 1225303501. The reversal of 1225303440 is 443035221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1225303440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2552476 + ... + 2552955.

Almost surely, 2^1225303440 is an apocalyptic number.

1225303440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225303440 is an abundant number, since it is smaller than the sum of its proper divisors (2573137968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225303440 is a wasteful number, since it uses less digits than its factorization.

1225303440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105447 (or 5105441 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 1225303440 is about 35004.3345887334. The cubic root of 1225303440 is about 1070.0758207546.

Adding to 1225303440 its reverse (443035221), we get a palindrome (1668338661).

The spelling of 1225303440 in words is "one billion, two hundred twenty-five million, three hundred three thousand, four hundred forty".