1123981407 has 8 divisors (see below), whose sum is σ = 1665157680. Its totient is φ = 749320920.

The previous prime is 1123981399. The next prime is 1123981409. The reversal of 1123981407 is 7041893211.

It is a happy number.

1123981407 is a `hidden beast` number, since 11 + 239 + 8 + 1 + 407 = 666.

It is not a de Polignac number, because 1123981407 - 2³ = 1123981399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123981409) 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, 20814444 + ... + 20814497.

It is an arithmetic number, because the mean of its divisors is an integer number (208144710).

Almost surely, 2^1123981407 is an apocalyptic number.

1123981407 is a deficient number, since it is larger than the sum of its proper divisors (541176273).

1123981407 is an equidigital number, since it uses as much as digits as its factorization.

1123981407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41628950 (or 41628944 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1123981407 is about 33525.8319359863. The cubic root of 1123981407 is about 1039.7279265487.

The spelling of 1123981407 in words is "one billion, one hundred twenty-three million, nine hundred eighty-one thousand, four hundred seven".