121654890 has 192 divisors, whose sum is σ = 394377984. Its totient is φ = 25380864.

The previous prime is 121654859. The next prime is 121654903. The reversal of 121654890 is 98456121.

121654890 is a `hidden beast` number, since 1 + 21 + 6 + 548 + 90 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 396117 + ... + 396423.

It is an arithmetic number, because the mean of its divisors is an integer number (2054052).

Almost surely, 2^121654890 is an apocalyptic number.

121654890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121654890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197188992).

121654890 is an abundant number, since it is smaller than the sum of its proper divisors (272723094).

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

121654890 is a wasteful number, since it uses less digits than its factorization.

121654890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 121654890 is about 11029.7275578321. The cubic root of 121654890 is about 495.4994652506.

The spelling of 121654890 in words is "one hundred twenty-one million, six hundred fifty-four thousand, eight hundred ninety".