121974639 has 8 divisors (see below), whose sum is σ = 165060480. Its totient is φ = 80102616.

The previous prime is 121974599. The next prime is 121974641. The reversal of 121974639 is 936479121.

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

It is not a de Polignac number, because 121974639 - 2⁸ = 121974383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121974639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121974689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303219 + ... + 303620.

It is an arithmetic number, because the mean of its divisors is an integer number (20632560).

Almost surely, 2^121974639 is an apocalyptic number.

121974639 is a deficient number, since it is larger than the sum of its proper divisors (43085841).

121974639 is an equidigital number, since it uses as much as digits as its factorization.

121974639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606909.

The product of its digits is 81648, while the sum is 42.

The square root of 121974639 is about 11044.2129189907. The cubic root of 121974639 is about 495.9331972445.

It can be divided in two parts, 12197 and 4639, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 121974639 in words is "one hundred twenty-one million, nine hundred seventy-four thousand, six hundred thirty-nine".