987517393 has 4 divisors (see below), whose sum is σ = 987674688. Its totient is φ = 987360100.

The previous prime is 987517379. The next prime is 987517409. The reversal of 987517393 is 393715789.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987517393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 987517393.

It is not an unprimeable number, because it can be changed into a prime (987517303) 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, 68821 + ... + 81922.

It is an arithmetic number, because the mean of its divisors is an integer number (246918672).

Almost surely, 2^987517393 is an apocalyptic number.

It is an amenable number.

987517393 is a deficient number, since it is larger than the sum of its proper divisors (157295).

987517393 is a wasteful number, since it uses less digits than its factorization.

987517393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157294.

The product of its digits is 1428840, while the sum is 52.

The square root of 987517393 is about 31424.7894662796. The cubic root of 987517393 is about 995.8216971001.

The spelling of 987517393 in words is "nine hundred eighty-seven million, five hundred seventeen thousand, three hundred ninety-three".