1220520394 has 8 divisors (see below), whose sum is σ = 1833798528. Its totient is φ = 609254220.

The previous prime is 1220520383. The next prime is 1220520397. The reversal of 1220520394 is 4930250221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1220520397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501472 + ... + 503899.

It is an arithmetic number, because the mean of its divisors is an integer number (229224816).

Almost surely, 2^1220520394 is an apocalyptic number.

1220520394 is a deficient number, since it is larger than the sum of its proper divisors (613278134).

1220520394 is a wasteful number, since it uses less digits than its factorization.

1220520394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005980.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1220520394 is about 34935.9470173631. The cubic root of 1220520394 is about 1068.6816365469.

The spelling of 1220520394 in words is "one billion, two hundred twenty million, five hundred twenty thousand, three hundred ninety-four".