121986156 has 48 divisors (see below), whose sum is σ = 300460160. Its totient is φ = 38413440.

The previous prime is 121986127. The next prime is 121986157. The reversal of 121986156 is 651689121.

It is not an unprimeable number, because it can be changed into a prime (121986157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129720 + ... + 130656.

Almost surely, 2^121986156 is an apocalyptic number.

It is an amenable number.

121986156 is an abundant number, since it is smaller than the sum of its proper divisors (178474004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121986156 is a wasteful number, since it uses less digits than its factorization.

121986156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1532 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 121986156 is about 11044.7343109737. The cubic root of 121986156 is about 495.9488056336.

The spelling of 121986156 in words is "one hundred twenty-one million, nine hundred eighty-six thousand, one hundred fifty-six".