121786942 has 4 divisors (see below), whose sum is σ = 182680416. Its totient is φ = 60893470.

The previous prime is 121786919. The next prime is 121786961. The reversal of 121786942 is 249687121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 249687121 = 1051 ⋅237571.

It is a super-2 number, since 2×121786942² = 29664118483422728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 121786895 and 121786904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30446734 + ... + 30446737.

It is an arithmetic number, because the mean of its divisors is an integer number (45670104).

Almost surely, 2^121786942 is an apocalyptic number.

121786942 is a deficient number, since it is larger than the sum of its proper divisors (60893474).

121786942 is an equidigital number, since it uses as much as digits as its factorization.

121786942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60893473.

The product of its digits is 48384, while the sum is 40.

The square root of 121786942 is about 11035.7121202032. The cubic root of 121786942 is about 495.6786826939.

The spelling of 121786942 in words is "one hundred twenty-one million, seven hundred eighty-six thousand, nine hundred forty-two".