121779644 has 12 divisors (see below), whose sum is σ = 243559344. Its totient is φ = 52191264.

The previous prime is 121779629. The next prime is 121779659. The reversal of 121779644 is 446977121.

It is an interprime number because it is at equal distance from previous prime (121779629) and next prime (121779659).

121779644 is an admirable number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2174609 + ... + 2174664.

It is an arithmetic number, because the mean of its divisors is an integer number (20296612).

Almost surely, 2^121779644 is an apocalyptic number.

121779644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121779644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121779644 is a wasteful number, since it uses less digits than its factorization.

121779644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4349284 (or 4349282 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 121779644 is about 11035.3814614629. The cubic root of 121779644 is about 495.6687814264.

The spelling of 121779644 in words is "one hundred twenty-one million, seven hundred seventy-nine thousand, six hundred forty-four".