121437918 has 24 divisors (see below), whose sum is σ = 300703728. Its totient is φ = 34696512.

The previous prime is 121437863. The next prime is 121437923. The reversal of 121437918 is 819734121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481771 + ... + 482022.

It is an arithmetic number, because the mean of its divisors is an integer number (12529322).

Almost surely, 2^121437918 is an apocalyptic number.

121437918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121437918 is an abundant number, since it is smaller than the sum of its proper divisors (179265810).

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

121437918 is a wasteful number, since it uses less digits than its factorization.

121437918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963808 (or 963805 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 121437918 is about 11019.8873859945. The cubic root of 121437918 is about 495.2047148356.

The spelling of 121437918 in words is "one hundred twenty-one million, four hundred thirty-seven thousand, nine hundred eighteen".