1989749134 has 4 divisors (see below), whose sum is σ = 2984623704. Its totient is φ = 994874566.

The previous prime is 1989749093. The next prime is 1989749137. The reversal of 1989749134 is 4319479891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989749137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497437282 + ... + 497437285.

It is an arithmetic number, because the mean of its divisors is an integer number (746155926).

Almost surely, 2^1989749134 is an apocalyptic number.

1989749134 is a deficient number, since it is larger than the sum of its proper divisors (994874570).

1989749134 is an equidigital number, since it uses as much as digits as its factorization.

1989749134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994874569.

The product of its digits is 1959552, while the sum is 55.

The square root of 1989749134 is about 44606.6041523001. The cubic root of 1989749134 is about 1257.7648148332.

The spelling of 1989749134 in words is "one billion, nine hundred eighty-nine million, seven hundred forty-nine thousand, one hundred thirty-four".