79440397 has 4 divisors (see below), whose sum is σ = 79916256. Its totient is φ = 78964540.

The previous prime is 79440391. The next prime is 79440401. The reversal of 79440397 is 79304497.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79304497 = 313 ⋅253369.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79440397 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 (79440391) 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, 237679 + ... + 238012.

It is an arithmetic number, because the mean of its divisors is an integer number (19979064).

Almost surely, 2^79440397 is an apocalyptic number.

It is an amenable number.

79440397 is a deficient number, since it is larger than the sum of its proper divisors (475859).

79440397 is a wasteful number, since it uses less digits than its factorization.

79440397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475858.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 79440397 is about 8912.9342530953. The cubic root of 79440397 is about 429.8798961485.

The spelling of 79440397 in words is "seventy-nine million, four hundred forty thousand, three hundred ninety-seven".