121603640 has 16 divisors (see below), whose sum is σ = 273608280. Its totient is φ = 48641440.

The previous prime is 121603609. The next prime is 121603679. The reversal of 121603640 is 46306121.

It is a happy number.

It is a super-2 number, since 2×121603640² = 29574890522499200, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520006 + ... + 1520085.

Almost surely, 2^121603640 is an apocalyptic number.

121603640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121603640 is an abundant number, since it is smaller than the sum of its proper divisors (152004640).

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

121603640 is a wasteful number, since it uses less digits than its factorization.

121603640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040102 (or 3040098 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 121603640 is about 11027.4040462840. The cubic root of 121603640 is about 495.4298751875.

Adding to 121603640 its reverse (46306121), we get a palindrome (167909761).

The spelling of 121603640 in words is "one hundred twenty-one million, six hundred three thousand, six hundred forty".