121649740 has 24 divisors (see below), whose sum is σ = 259796880. Its totient is φ = 47834688.

The previous prime is 121649719. The next prime is 121649741. The reversal of 121649740 is 47946121.

It is a junction number, because it is equal to n+sod(n) for n = 121649696 and 121649705.

It is not an unprimeable number, because it can be changed into a prime (121649741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50367 + ... + 52726.

It is an arithmetic number, because the mean of its divisors is an integer number (10824870).

Almost surely, 2^121649740 is an apocalyptic number.

121649740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121649740 is an abundant number, since it is smaller than the sum of its proper divisors (138147140).

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

121649740 is a wasteful number, since it uses less digits than its factorization.

121649740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103161 (or 103159 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 121649740 is about 11029.4940953790. The cubic root of 121649740 is about 495.4924731813.

It can be divided in two parts, 12164 and 9740, that added together give a square (21904 = 148²).

The spelling of 121649740 in words is "one hundred twenty-one million, six hundred forty-nine thousand, seven hundred forty".