121603440 has 80 divisors (see below), whose sum is σ = 430829568. Its totient is φ = 27794688.

The previous prime is 121603411. The next prime is 121603463. The reversal of 121603440 is 44306121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 34512 + ... + 37871.

Almost surely, 2^121603440 is an apocalyptic number.

121603440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121603440 is an abundant number, since it is smaller than the sum of its proper divisors (309226128).

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

121603440 is a wasteful number, since it uses less digits than its factorization.

121603440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72406 (or 72400 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 121603440 is about 11027.3949779628. The cubic root of 121603440 is about 495.4296035782.

Adding to 121603440 its reverse (44306121), we get a palindrome (165909561).

The spelling of 121603440 in words is "one hundred twenty-one million, six hundred three thousand, four hundred forty".