74747399 has 4 divisors (see below), whose sum is σ = 75206136. Its totient is φ = 74288664.

The previous prime is 74747371. The next prime is 74747473. The reversal of 74747399 is 99374747.

74747399 = 307² + 308² + ... + 632².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99374747 = 31 ⋅3205637.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74747399 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 (74747369) 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, 229124 + ... + 229449.

It is an arithmetic number, because the mean of its divisors is an integer number (18801534).

Almost surely, 2^74747399 is an apocalyptic number.

74747399 is a deficient number, since it is larger than the sum of its proper divisors (458737).

74747399 is a wasteful number, since it uses less digits than its factorization.

74747399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458736.

The product of its digits is 1333584, while the sum is 50.

The square root of 74747399 is about 8645.6578118730. The cubic root of 74747399 is about 421.2423513831.

The spelling of 74747399 in words is "seventy-four million, seven hundred forty-seven thousand, three hundred ninety-nine".