121399875 has 72 divisors (see below), whose sum is σ = 229796736. Its totient is φ = 61596000.

The previous prime is 121399841. The next prime is 121399891. The reversal of 121399875 is 578993121.

It is not a de Polignac number, because 121399875 - 2¹⁴ = 121383491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 121399875.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2057596 + ... + 2057654.

Almost surely, 2^121399875 is an apocalyptic number.

121399875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121399875 is a deficient number, since it is larger than the sum of its proper divisors (108396861).

121399875 is an equidigital number, since it uses as much as digits as its factorization.

121399875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 98 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 121399875 is about 11018.1611442200. The cubic root of 121399875 is about 495.1529983129.

It can be divided in two parts, 1 and 21399875, that added together give a square (21399876 = 4626²).

The spelling of 121399875 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, eight hundred seventy-five".