121587638 has 16 divisors (see below), whose sum is σ = 195027264. Its totient is φ = 56649600.

The previous prime is 121587619. The next prime is 121587659. The reversal of 121587638 is 836785121.

It is a junction number, because it is equal to n+sod(n) for n = 121587595 and 121587604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14270 + ... + 21137.

It is an arithmetic number, because the mean of its divisors is an integer number (12189204).

Almost surely, 2^121587638 is an apocalyptic number.

121587638 is a deficient number, since it is larger than the sum of its proper divisors (73439626).

121587638 is a wasteful number, since it uses less digits than its factorization.

121587638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35527.

The product of its digits is 80640, while the sum is 41.

The square root of 121587638 is about 11026.6784663379. The cubic root of 121587638 is about 495.4081427880.

The spelling of 121587638 in words is "one hundred twenty-one million, five hundred eighty-seven thousand, six hundred thirty-eight".