121752738 has 12 divisors (see below), whose sum is σ = 263797638. Its totient is φ = 40584240.

The previous prime is 121752733. The next prime is 121752749. The reversal of 121752738 is 837257121.

121752738 is a `hidden beast` number, since 121 + 7 + 527 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 114639849 + 7112889 = 10707^2 + 2667^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121752733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3382003 + ... + 3382038.

Almost surely, 2^121752738 is an apocalyptic number.

121752738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121752738 is an abundant number, since it is smaller than the sum of its proper divisors (142044900).

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

121752738 is a wasteful number, since it uses less digits than its factorization.

121752738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6764049 (or 6764046 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 121752738 is about 11034.1623152825. The cubic root of 121752738 is about 495.6322743767.

The spelling of 121752738 in words is "one hundred twenty-one million, seven hundred fifty-two thousand, seven hundred thirty-eight".