1189021994 has 4 divisors (see below), whose sum is σ = 1783532994. Its totient is φ = 594510996.

The previous prime is 1189021991. The next prime is 1189021997. The reversal of 1189021994 is 4991209811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4991209811 = 7 ⋅713029973.

It is an interprime number because it is at equal distance from previous prime (1189021991) and next prime (1189021997).

It can be written as a sum of positive squares in only one way, i.e., 644499769 + 544522225 = 25387^2 + 23335^2 .

It is not an unprimeable number, because it can be changed into a prime (1189021991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 297255497 + ... + 297255500.

Almost surely, 2^1189021994 is an apocalyptic number.

1189021994 is a deficient number, since it is larger than the sum of its proper divisors (594511000).

1189021994 is an equidigital number, since it uses as much as digits as its factorization.

1189021994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594510999.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1189021994 is about 34482.1982187911. The cubic root of 1189021994 is about 1059.4081168184.

The spelling of 1189021994 in words is "one billion, one hundred eighty-nine million, twenty-one thousand, nine hundred ninety-four".