74390 has 16 divisors (see below), whose sum is σ = 137808. Its totient is φ = 28896.

The previous prime is 74383. The next prime is 74411. The reversal of 74390 is 9347.

74390 = T₃₆ + T₃₇ + ... + T₇₈.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

74390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344 + ... + 516.

It is an arithmetic number, because the mean of its divisors is an integer number (8613).

2⁷⁴³⁹⁰ is an apocalyptic number.

74390 is a deficient number, since it is larger than the sum of its proper divisors (63418).

74390 is a wasteful number, since it uses less digits than its factorization.

74390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 74390 is about 272.7453024343. The cubic root of 74390 is about 42.0569899066.

It can be divided in two parts, 74 and 390, that added together give a palindrome (464).

The spelling of 74390 in words is "seventy-four thousand, three hundred ninety".