121445640 has 48 divisors (see below), whose sum is σ = 394699500. Its totient is φ = 32385408.

The previous prime is 121445629. The next prime is 121445651. The reversal of 121445640 is 46544121.

121445640 is a `hidden beast` number, since 1 + 2 + 14 + 4 + 5 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (121445629) and next prime (121445651).

It can be written as a sum of positive squares in 2 ways, for example, as 117548964 + 3896676 = 10842^2 + 1974^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168315 + ... + 169034.

Almost surely, 2^121445640 is an apocalyptic number.

121445640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121445640 is an abundant number, since it is smaller than the sum of its proper divisors (273253860).

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

121445640 is a wasteful number, since it uses less digits than its factorization.

121445640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337366 (or 337359 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 121445640 is about 11020.2377469817. The cubic root of 121445640 is about 495.2152109800.

Adding to 121445640 its reverse (46544121), we get a palindrome (167989761).

The spelling of 121445640 in words is "one hundred twenty-one million, four hundred forty-five thousand, six hundred forty".