121942638 has 32 divisors (see below), whose sum is σ = 274039200. Its totient is φ = 40189248.

The previous prime is 121942633. The next prime is 121942661. The reversal of 121942638 is 836249121.

121942638 is a `hidden beast` number, since 1 + 2 + 19 + 4 + 2 + 638 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121942633) 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, 7881 + ... + 17492.

It is an arithmetic number, because the mean of its divisors is an integer number (8563725).

Almost surely, 2^121942638 is an apocalyptic number.

121942638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121942638 is an abundant number, since it is smaller than the sum of its proper divisors (152096562).

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

121942638 is a wasteful number, since it uses less digits than its factorization.

121942638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25473 (or 25467 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 121942638 is about 11042.7640561591. The cubic root of 121942638 is about 495.8898228008.

The spelling of 121942638 in words is "one hundred twenty-one million, nine hundred forty-two thousand, six hundred thirty-eight".