12987951 has 8 divisors (see below), whose sum is σ = 17364480. Its totient is φ = 8635032.

The previous prime is 12987917. The next prime is 12987967. The reversal of 12987951 is 15978921.

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

It is not a de Polignac number, because 12987951 - 2¹⁵ = 12955183 is a prime.

It is a super-3 number, since 3×12987951³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12987971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4575 + ... + 6848.

It is an arithmetic number, because the mean of its divisors is an integer number (2170560).

Almost surely, 2^12987951 is an apocalyptic number.

12987951 is a deficient number, since it is larger than the sum of its proper divisors (4376529).

12987951 is a wasteful number, since it uses less digits than its factorization.

12987951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11805.

The product of its digits is 45360, while the sum is 42.

The square root of 12987951 is about 3603.8799924526. The cubic root of 12987951 is about 235.0608021335.

The spelling of 12987951 in words is "twelve million, nine hundred eighty-seven thousand, nine hundred fifty-one".