1011880399 has 4 divisors (see below), whose sum is σ = 1030972536. Its totient is φ = 992788264.

The previous prime is 1011880381. The next prime is 1011880411. The reversal of 1011880399 is 9930881101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1011880399 - 2⁷ = 1011880271 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011880339) 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, 9545989 + ... + 9546094.

It is an arithmetic number, because the mean of its divisors is an integer number (257743134).

Almost surely, 2^1011880399 is an apocalyptic number.

1011880399 is a deficient number, since it is larger than the sum of its proper divisors (19092137).

1011880399 is an equidigital number, since it uses as much as digits as its factorization.

1011880399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19092136.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 1011880399 is about 31810.0675730185. The cubic root of 1011880399 is about 1003.9445530429.

The spelling of 1011880399 in words is "one billion, eleven million, eight hundred eighty thousand, three hundred ninety-nine".