187582989397 has 4 divisors (see below), whose sum is σ = 187847564140. Its totient is φ = 187318414656.

The previous prime is 187582989371. The next prime is 187582989401. The reversal of 187582989397 is 793989285781.

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

It can be written as a sum of positive squares in 2 ways, for example, as 116553277201 + 71029712196 = 341399^2 + 266514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187582989397 is a prime.

It is a super-4 number, since 4×187582989397⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187582986397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132286308 + ... + 132287725.

It is an arithmetic number, because the mean of its divisors is an integer number (46961891035).

Almost surely, 2^187582989397 is an apocalyptic number.

It is an amenable number.

187582989397 is a deficient number, since it is larger than the sum of its proper divisors (264574743).

187582989397 is an equidigital number, since it uses as much as digits as its factorization.

187582989397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264574742.

The product of its digits is 548674560, while the sum is 76.

The spelling of 187582989397 in words is "one hundred eighty-seven billion, five hundred eighty-two million, nine hundred eighty-nine thousand, three hundred ninety-seven".