1121872394 has 4 divisors (see below), whose sum is σ = 1682808594. Its totient is φ = 560936196.

The previous prime is 1121872373. The next prime is 1121872417. The reversal of 1121872394 is 4932781211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4932781211 = 1543 ⋅3196877.

It can be written as a sum of positive squares in only one way, i.e., 1023168169 + 98704225 = 31987^2 + 9935^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280468097 + ... + 280468100.

Almost surely, 2^1121872394 is an apocalyptic number.

1121872394 is a deficient number, since it is larger than the sum of its proper divisors (560936200).

1121872394 is an equidigital number, since it uses as much as digits as its factorization.

1121872394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560936199.

The product of its digits is 24192, while the sum is 38.

The square root of 1121872394 is about 33494.3636153906. The cubic root of 1121872394 is about 1039.0772121515.

The spelling of 1121872394 in words is "one billion, one hundred twenty-one million, eight hundred seventy-two thousand, three hundred ninety-four".