121690 has 16 divisors (see below), whose sum is σ = 224928. Its totient is φ = 47376.

The previous prime is 121687. The next prime is 121697. The reversal of 121690 is 96121.

121690 = 154² + 155² + ... + 158².

It is a super-2 number, since 2×121690² = 29616912200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (121697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289 + ... + 571.

It is an arithmetic number, because the mean of its divisors is an integer number (14058).

2¹²¹⁶⁹⁰ is an apocalyptic number.

121690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121690 is a deficient number, since it is larger than the sum of its proper divisors (103238).

121690 is a wasteful number, since it uses less digits than its factorization.

121690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 121690 is about 348.8409379646. The cubic root of 121690 is about 49.5547128256.

The spelling of 121690 in words is "one hundred twenty-one thousand, six hundred ninety".