1225200440 has 16 divisors (see below), whose sum is σ = 2756701080. Its totient is φ = 490080160.

The previous prime is 1225200401. The next prime is 1225200461. The reversal of 1225200440 is 440025221.

It is a happy number.

It is a super-2 number, since 2×1225200440² = 3002232236352387200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15314966 + ... + 15315045.

Almost surely, 2^1225200440 is an apocalyptic number.

1225200440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225200440 is an abundant number, since it is smaller than the sum of its proper divisors (1531500640).

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

1225200440 is a wasteful number, since it uses less digits than its factorization.

1225200440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30630022 (or 30630018 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1225200440 is about 35002.8633114493. The cubic root of 1225200440 is about 1070.0458361009.

Adding to 1225200440 its reverse (440025221), we get a palindrome (1665225661).

The spelling of 1225200440 in words is "one billion, two hundred twenty-five million, two hundred thousand, four hundred forty".