74199138 has 32 divisors (see below), whose sum is σ = 160465536. Its totient is φ = 22737408.

The previous prime is 74199131. The next prime is 74199149. The reversal of 74199138 is 83199147.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 74199138.

It is not an unprimeable number, because it can be changed into a prime (74199131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18706 + ... + 22322.

It is an arithmetic number, because the mean of its divisors is an integer number (5014548).

Almost surely, 2^74199138 is an apocalyptic number.

74199138 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

74199138 is an abundant number, since it is smaller than the sum of its proper divisors (86266398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

74199138 is a wasteful number, since it uses less digits than its factorization.

74199138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3898.

The product of its digits is 54432, while the sum is 42.

The square root of 74199138 is about 8613.8921516351. The cubic root of 74199138 is about 420.2099064140.

Subtracting 74199138 from its reverse (83199147), we obtain a palindrome (9000009).

The spelling of 74199138 in words is "seventy-four million, one hundred ninety-nine thousand, one hundred thirty-eight".