987661397 has 8 divisors (see below), whose sum is σ = 1003875840. Its totient is φ = 971539920.

The previous prime is 987661379. The next prime is 987661403. The reversal of 987661397 is 793166789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 987661397 - 2⁸ = 987661141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987661897) 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, 1658 + ... + 44475.

It is an arithmetic number, because the mean of its divisors is an integer number (125484480).

Almost surely, 2^987661397 is an apocalyptic number.

It is an amenable number.

987661397 is a deficient number, since it is larger than the sum of its proper divisors (16214443).

987661397 is a wasteful number, since it uses less digits than its factorization.

987661397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46483.

The product of its digits is 3429216, while the sum is 56.

The square root of 987661397 is about 31427.0806312009. The cubic root of 987661397 is about 995.8700997371.

The spelling of 987661397 in words is "nine hundred eighty-seven million, six hundred sixty-one thousand, three hundred ninety-seven".