121435890 has 32 divisors (see below), whose sum is σ = 292985856. Its totient is φ = 32211840.

The previous prime is 121435871. The next prime is 121435903. The reversal of 121435890 is 98534121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4867 + ... + 16326.

It is an arithmetic number, because the mean of its divisors is an integer number (9155808).

Almost surely, 2^121435890 is an apocalyptic number.

121435890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121435890 is an abundant number, since it is smaller than the sum of its proper divisors (171549966).

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

121435890 is a wasteful number, since it uses less digits than its factorization.

121435890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21394.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 121435890 is about 11019.7953701509. The cubic root of 121435890 is about 495.2019581987.

The spelling of 121435890 in words is "one hundred twenty-one million, four hundred thirty-five thousand, eight hundred ninety".