1220335440 has 40 divisors (see below), whose sum is σ = 3783040608. Its totient is φ = 325422720.

The previous prime is 1220335423. The next prime is 1220335453. The reversal of 1220335440 is 445330221.

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

It is a super-2 number, since 2×1220335440² = 2978437172239987200, which contains 22 as substring.

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 1220335440.

It is a congruent number.

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, 2542126 + ... + 2542605.

Almost surely, 2^1220335440 is an apocalyptic number.

1220335440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220335440 is an abundant number, since it is smaller than the sum of its proper divisors (2562705168).

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

1220335440 is a wasteful number, since it uses less digits than its factorization.

1220335440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5084747 (or 5084741 counting only the distinct ones).

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

The square root of 1220335440 is about 34933.2998727575. The cubic root of 1220335440 is about 1068.6276522166.

Adding to 1220335440 its reverse (445330221), we get a palindrome (1665665661).

The spelling of 1220335440 in words is "one billion, two hundred twenty million, three hundred thirty-five thousand, four hundred forty".