75038921 has 4 divisors (see below), whose sum is σ = 77626500. Its totient is φ = 72451344.

The previous prime is 75038917. The next prime is 75038927. The reversal of 75038921 is 12983057.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12983057 = 61 ⋅212837.

It can be written as a sum of positive squares in 2 ways, for example, as 26666896 + 48372025 = 5164^2 + 6955^2 .

It is a cyclic number.

It is not a de Polignac number, because 75038921 - 2² = 75038917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75038927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1293746 + ... + 1293803.

It is an arithmetic number, because the mean of its divisors is an integer number (19406625).

Almost surely, 2^75038921 is an apocalyptic number.

It is an amenable number.

75038921 is a deficient number, since it is larger than the sum of its proper divisors (2587579).

75038921 is a wasteful number, since it uses less digits than its factorization.

75038921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587578.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 75038921 is about 8662.5008513708. The cubic root of 75038921 is about 421.7892694639.

The spelling of 75038921 in words is "seventy-five million, thirty-eight thousand, nine hundred twenty-one".