121829865 has 8 divisors (see below), whose sum is σ = 194927808. Its totient is φ = 64975920.

The previous prime is 121829861. The next prime is 121829891. The reversal of 121829865 is 568928121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121829865 - 2² = 121829861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121829861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4060981 + ... + 4061010.

It is an arithmetic number, because the mean of its divisors is an integer number (24365976).

Almost surely, 2^121829865 is an apocalyptic number.

121829865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121829865 is a deficient number, since it is larger than the sum of its proper divisors (73097943).

121829865 is an equidigital number, since it uses as much as digits as its factorization.

121829865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8121999.

The product of its digits is 69120, while the sum is 42.

The square root of 121829865 is about 11037.6566806546. The cubic root of 121829865 is about 495.7369087421.

The spelling of 121829865 in words is "one hundred twenty-one million, eight hundred twenty-nine thousand, eight hundred sixty-five".