1309987198 has 16 divisors (see below), whose sum is σ = 2120723136. Its totient is φ = 603298080.

The previous prime is 1309987193. The next prime is 1309987247. The reversal of 1309987198 is 8917899031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309987193) 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, 42373 + ... + 66448.

It is an arithmetic number, because the mean of its divisors is an integer number (132545196).

Almost surely, 2^1309987198 is an apocalyptic number.

1309987198 is a deficient number, since it is larger than the sum of its proper divisors (810735938).

1309987198 is a wasteful number, since it uses less digits than its factorization.

1309987198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109299.

The product of its (nonzero) digits is 979776, while the sum is 55.

The square root of 1309987198 is about 36193.7452883782. The cubic root of 1309987198 is about 1094.1806170400.

The spelling of 1309987198 in words is "one billion, three hundred nine million, nine hundred eighty-seven thousand, one hundred ninety-eight".