1128156907 has 4 divisors (see below), whose sum is σ = 1194519096. Its totient is φ = 1061794720.

The previous prime is 1128156889. The next prime is 1128156947. The reversal of 1128156907 is 7096518211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128156907 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 1128156907.

It is not an unprimeable number, because it can be changed into a prime (1128156947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33181069 + ... + 33181102.

It is an arithmetic number, because the mean of its divisors is an integer number (298629774).

Almost surely, 2^1128156907 is an apocalyptic number.

1128156907 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1128156907 is a deficient number, since it is larger than the sum of its proper divisors (66362189).

1128156907 is an equidigital number, since it uses as much as digits as its factorization.

1128156907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66362188.

The product of its (nonzero) digits is 30240, while the sum is 40.

The square root of 1128156907 is about 33588.0470852355. The cubic root of 1128156907 is about 1041.0138372215.

The spelling of 1128156907 in words is "one billion, one hundred twenty-eight million, one hundred fifty-six thousand, nine hundred seven".