74378405 has 4 divisors (see below), whose sum is σ = 89254092. Its totient is φ = 59502720.

The previous prime is 74378401. The next prime is 74378413. The reversal of 74378405 is 50487347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50487347 = 29 ⋅1740943.

It can be written as a sum of positive squares in 2 ways, for example, as 32982049 + 41396356 = 5743^2 + 6434^2 .

It is not a de Polignac number, because 74378405 - 2² = 74378401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74378401) 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, 7437836 + ... + 7437845.

It is an arithmetic number, because the mean of its divisors is an integer number (22313523).

Almost surely, 2^74378405 is an apocalyptic number.

It is an amenable number.

74378405 is a deficient number, since it is larger than the sum of its proper divisors (14875687).

74378405 is a wasteful number, since it uses less digits than its factorization.

74378405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14875686.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 74378405 is about 8624.2915651084. The cubic root of 74378405 is about 420.5480468399.

The spelling of 74378405 in words is "seventy-four million, three hundred seventy-eight thousand, four hundred five".