1225423520 has 48 divisors (see below), whose sum is σ = 2897156808. Its totient is φ = 489815040.

The previous prime is 1225423513. The next prime is 1225423541. The reversal of 1225423520 is 253245221.

It can be written as a sum of positive squares in 4 ways, for example, as 645769744 + 579653776 = 25412^2 + 24076^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1225423520.

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, 426890 + ... + 429750.

Almost surely, 2^1225423520 is an apocalyptic number.

1225423520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225423520 is an abundant number, since it is smaller than the sum of its proper divisors (1671733288).

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

1225423520 is a wasteful number, since it uses less digits than its factorization.

1225423520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5553 (or 5545 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 1225423520 is about 35006.0497628624. The cubic root of 1225423520 is about 1070.1107754995.

Adding to 1225423520 its reverse (253245221), we get a palindrome (1478668741).

The spelling of 1225423520 in words is "one billion, two hundred twenty-five million, four hundred twenty-three thousand, five hundred twenty".