1220455730 has 32 divisors (see below), whose sum is σ = 2429756784. Its totient is φ = 438448896.

The previous prime is 1220455727. The next prime is 1220455741. The reversal of 1220455730 is 375540221.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 837118489 + 383337241 = 28933^2 + 19579^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1220455693 and 1220455702.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122057 + ... + 131676.

Almost surely, 2^1220455730 is an apocalyptic number.

1220455730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220455730 is a deficient number, since it is larger than the sum of its proper divisors (1209301054).

1220455730 is a wasteful number, since it uses less digits than its factorization.

1220455730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253790.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 1220455730 is about 34935.0215399962. The cubic root of 1220455730 is about 1068.6627630538.

Adding to 1220455730 its reverse (375540221), we get a palindrome (1595995951).

The spelling of 1220455730 in words is "one billion, two hundred twenty million, four hundred fifty-five thousand, seven hundred thirty".