1118128457 has 8 divisors (see below), whose sum is σ = 1127755200. Its totient is φ = 1108542960.

The previous prime is 1118128399. The next prime is 1118128477. The reversal of 1118128457 is 7548218111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1118128457 - 2⁶ = 1118128393 is a prime.

It is a super-2 number, since 2×1118128457² = 2500422492706401698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1118128457.

It is not an unprimeable number, because it can be changed into a prime (1118128477) 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, 45419 + ... + 65567.

It is an arithmetic number, because the mean of its divisors is an integer number (140969400).

Almost surely, 2^1118128457 is an apocalyptic number.

It is an amenable number.

1118128457 is a deficient number, since it is larger than the sum of its proper divisors (9626743).

1118128457 is a wasteful number, since it uses less digits than its factorization.

1118128457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20623.

The product of its digits is 17920, while the sum is 38.

The square root of 1118128457 is about 33438.4278488089. The cubic root of 1118128457 is about 1037.9200469179.

The spelling of 1118128457 in words is "one billion, one hundred eighteen million, one hundred twenty-eight thousand, four hundred fifty-seven".