121696390 has 16 divisors (see below), whose sum is σ = 226120320. Its totient is φ = 47108160.

The previous prime is 121696369. The next prime is 121696411. The reversal of 121696390 is 93696121.

It is an interprime number because it is at equal distance from previous prime (121696369) and next prime (121696411).

It is a super-2 number, since 2×121696390² = 29620022678064200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 195975 + ... + 196594.

It is an arithmetic number, because the mean of its divisors is an integer number (14132520).

Almost surely, 2^121696390 is an apocalyptic number.

121696390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121696390 is a deficient number, since it is larger than the sum of its proper divisors (104423930).

121696390 is a wasteful number, since it uses less digits than its factorization.

121696390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392607.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 121696390 is about 11031.6086768884. The cubic root of 121696390 is about 495.5558019092. Note that the first 3 decimals are identical.

The spelling of 121696390 in words is "one hundred twenty-one million, six hundred ninety-six thousand, three hundred ninety".