121623765 has 16 divisors (see below), whose sum is σ = 195000000. Its totient is φ = 64732032.

The previous prime is 121623713. The next prime is 121623791. The reversal of 121623765 is 567326121.

It is not a de Polignac number, because 121623765 - 2¹⁹ = 121099477 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640 + ... + 15609.

It is an arithmetic number, because the mean of its divisors is an integer number (12187500).

Almost surely, 2^121623765 is an apocalyptic number.

121623765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121623765 is a deficient number, since it is larger than the sum of its proper divisors (73376235).

121623765 is a wasteful number, since it uses less digits than its factorization.

121623765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16756.

The product of its digits is 15120, while the sum is 33.

The square root of 121623765 is about 11028.3165079716. The cubic root of 121623765 is about 495.4572043482.

Adding to 121623765 its reverse (567326121), we get a palindrome (688949886).

The spelling of 121623765 in words is "one hundred twenty-one million, six hundred twenty-three thousand, seven hundred sixty-five".