75121394 has 8 divisors (see below), whose sum is σ = 112871388. Its totient is φ = 37497600.

The previous prime is 75121379. The next prime is 75121411. The reversal of 75121394 is 49312157.

It can be written as a sum of positive squares in 2 ways, for example, as 74046025 + 1075369 = 8605^2 + 1037^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 75121394.

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 3 ways as a sum of consecutive naturals, for example, 30047 + ... + 32450.

Almost surely, 2^75121394 is an apocalyptic number.

75121394 is a deficient number, since it is larger than the sum of its proper divisors (37749994).

75121394 is a wasteful number, since it uses less digits than its factorization.

75121394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63100.

The product of its digits is 7560, while the sum is 32.

The square root of 75121394 is about 8667.2598899537. The cubic root of 75121394 is about 421.9437381475.

The spelling of 75121394 in words is "seventy-five million, one hundred twenty-one thousand, three hundred ninety-four".