121819739 has 16 divisors (see below), whose sum is σ = 134184960. Its totient is φ = 110090880.

The previous prime is 121819727. The next prime is 121819751. The reversal of 121819739 is 937918121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121819727) and next prime (121819751).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121819739 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121819696 and 121819705.

It is not an unprimeable number, because it can be changed into a prime (121819039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72422 + ... + 74084.

It is an arithmetic number, because the mean of its divisors is an integer number (8386560).

Almost surely, 2^121819739 is an apocalyptic number.

121819739 is a deficient number, since it is larger than the sum of its proper divisors (12365221).

121819739 is a wasteful number, since it uses less digits than its factorization.

121819739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850.

The product of its digits is 27216, while the sum is 41.

The square root of 121819739 is about 11037.1979686875. The cubic root of 121819739 is about 495.7231738203.

The spelling of 121819739 in words is "one hundred twenty-one million, eight hundred nineteen thousand, seven hundred thirty-nine".