121897765 has 8 divisors (see below), whose sum is σ = 159575328. Its totient is φ = 88652880.

The previous prime is 121897753. The next prime is 121897777. The reversal of 121897765 is 567798121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121897753) and next prime (121897777).

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

It is not a de Polignac number, because 121897765 - 2⁷ = 121897637 is a prime.

It is a super-2 number, since 2×121897765² = 29718130223990450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108107 + ... + 1108216.

It is an arithmetic number, because the mean of its divisors is an integer number (19946916).

Almost surely, 2^121897765 is an apocalyptic number.

It is an amenable number.

121897765 is a deficient number, since it is larger than the sum of its proper divisors (37677563).

121897765 is a wasteful number, since it uses less digits than its factorization.

121897765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216339.

The product of its digits is 211680, while the sum is 46.

The square root of 121897765 is about 11040.7320862341. The cubic root of 121897765 is about 495.8289887496.

The spelling of 121897765 in words is "one hundred twenty-one million, eight hundred ninety-seven thousand, seven hundred sixty-five".