74729381 has 4 divisors (see below), whose sum is σ = 76749132. Its totient is φ = 72709632.

The previous prime is 74729377. The next prime is 74729387. The reversal of 74729381 is 18392747.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68145025 + 6584356 = 8255^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 74729381 - 2² = 74729377 is a prime.

It is a super-2 number, since 2×74729381² = 11168960769286322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74729387) by changing a digit.

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, 1009820 + ... + 1009893.

It is an arithmetic number, because the mean of its divisors is an integer number (19187283).

Almost surely, 2^74729381 is an apocalyptic number.

It is an amenable number.

74729381 is a deficient number, since it is larger than the sum of its proper divisors (2019751).

74729381 is a wasteful number, since it uses less digits than its factorization.

74729381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019750.

The product of its digits is 84672, while the sum is 41.

The square root of 74729381 is about 8644.6157230961. The cubic root of 74729381 is about 421.2085015782.

The spelling of 74729381 in words is "seventy-four million, seven hundred twenty-nine thousand, three hundred eighty-one".