83140987 has 4 divisors (see below), whose sum is σ = 84504016. Its totient is φ = 81777960.

The previous prime is 83140951. The next prime is 83140991. The reversal of 83140987 is 78904138.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78904138 = 2 ⋅39452069.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83140987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83140927) 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, 681423 + ... + 681544.

It is an arithmetic number, because the mean of its divisors is an integer number (21126004).

Almost surely, 2^83140987 is an apocalyptic number.

83140987 is a deficient number, since it is larger than the sum of its proper divisors (1363029).

83140987 is a wasteful number, since it uses less digits than its factorization.

83140987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363028.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 83140987 is about 9118.1679629189. The cubic root of 83140987 is about 436.4539134779.

The spelling of 83140987 in words is "eighty-three million, one hundred forty thousand, nine hundred eighty-seven".