121739894 has 4 divisors (see below), whose sum is σ = 182609844. Its totient is φ = 60869946.

The previous prime is 121739881. The next prime is 121739899. The reversal of 121739894 is 498937121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 498937121 = 1063 ⋅469367.

It is a super-2 number, since 2×121739894² = 29641203582262472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121739899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30434972 + ... + 30434975.

It is an arithmetic number, because the mean of its divisors is an integer number (45652461).

Almost surely, 2^121739894 is an apocalyptic number.

121739894 is a deficient number, since it is larger than the sum of its proper divisors (60869950).

121739894 is an equidigital number, since it uses as much as digits as its factorization.

121739894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60869949.

The product of its digits is 108864, while the sum is 44.

The square root of 121739894 is about 11033.5802892805. The cubic root of 121739894 is about 495.6148452689.

The spelling of 121739894 in words is "one hundred twenty-one million, seven hundred thirty-nine thousand, eight hundred ninety-four".