987212397 has 16 divisors (see below), whose sum is σ = 1346735808. Its totient is φ = 643019520.

The previous prime is 987212383. The next prime is 987212407. The reversal of 987212397 is 793212789.

It is not a de Polignac number, because 987212397 - 2⁴ = 987212381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987212377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25438 + ... + 51200.

It is an arithmetic number, because the mean of its divisors is an integer number (84170988).

Almost surely, 2^987212397 is an apocalyptic number.

It is an amenable number.

987212397 is a deficient number, since it is larger than the sum of its proper divisors (359523411).

987212397 is a wasteful number, since it uses less digits than its factorization.

987212397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26060.

The product of its digits is 381024, while the sum is 48.

The square root of 987212397 is about 31419.9362984714. The cubic root of 987212397 is about 995.7191662788.

The spelling of 987212397 in words is "nine hundred eighty-seven million, two hundred twelve thousand, three hundred ninety-seven".