121640679 has 48 divisors (see below), whose sum is σ = 192741120. Its totient is φ = 73664640.

The previous prime is 121640677. The next prime is 121640741. The reversal of 121640679 is 976046121.

121640679 is a `hidden beast` number, since 1 + 2 + 1 + 640 + 6 + 7 + 9 = 666.

It is not a de Polignac number, because 121640679 - 2¹ = 121640677 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121640677) by changing a digit.

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 in 47 ways as a sum of consecutive naturals, for example, 521947 + ... + 522179.

It is an arithmetic number, because the mean of its divisors is an integer number (4015440).

Almost surely, 2^121640679 is an apocalyptic number.

121640679 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121640679 is a deficient number, since it is larger than the sum of its proper divisors (71100441).

121640679 is a wasteful number, since it uses less digits than its factorization.

121640679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 121640679 is about 11029.0833254627. The cubic root of 121640679 is about 495.4801707334.

The spelling of 121640679 in words is "one hundred twenty-one million, six hundred forty thousand, six hundred seventy-nine".