121392987 has 8 divisors (see below), whose sum is σ = 162219600. Its totient is φ = 80747520.

The previous prime is 121392983. The next prime is 121393001. The reversal of 121392987 is 789293121.

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

It is not a de Polignac number, because 121392987 - 2² = 121392983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121392983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43714 + ... + 46407.

It is an arithmetic number, because the mean of its divisors is an integer number (20277450).

Almost surely, 2^121392987 is an apocalyptic number.

121392987 is a deficient number, since it is larger than the sum of its proper divisors (40826613).

121392987 is an equidigital number, since it uses as much as digits as its factorization.

121392987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90573.

The product of its digits is 54432, while the sum is 42.

The square root of 121392987 is about 11017.8485649423. The cubic root of 121392987 is about 495.1436334532.

The spelling of 121392987 in words is "one hundred twenty-one million, three hundred ninety-two thousand, nine hundred eighty-seven".