1220757243 has 8 divisors (see below), whose sum is σ = 1671667728. Its totient is φ = 791842464.

The previous prime is 1220757221. The next prime is 1220757253. The reversal of 1220757243 is 3427570221.

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

It is not a de Polignac number, because 1220757243 - 2⁸ = 1220756987 is a prime.

It is a super-2 number, since 2×1220757243² = 2980496492673922098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220757203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5498796 + ... + 5499017.

It is an arithmetic number, because the mean of its divisors is an integer number (208958466).

Almost surely, 2^1220757243 is an apocalyptic number.

1220757243 is a deficient number, since it is larger than the sum of its proper divisors (450910485).

1220757243 is a wasteful number, since it uses less digits than its factorization.

1220757243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10997853.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 1220757243 is about 34939.3366136222. The cubic root of 1220757243 is about 1068.7507600145.

The spelling of 1220757243 in words is "one billion, two hundred twenty million, seven hundred fifty-seven thousand, two hundred forty-three".