78923239 has 8 divisors (see below), whose sum is σ = 81774000. Its totient is φ = 76081152.

The previous prime is 78923233. The next prime is 78923249. The reversal of 78923239 is 93232987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78923239 - 2¹⁷ = 78792167 is a prime.

It is a super-2 number, since 2×78923239² = 12457755308502242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78923195 and 78923204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78923233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20532 + ... + 24070.

It is an arithmetic number, because the mean of its divisors is an integer number (10221750).

Almost surely, 2^78923239 is an apocalyptic number.

78923239 is a deficient number, since it is larger than the sum of its proper divisors (2850761).

78923239 is a wasteful number, since it uses less digits than its factorization.

78923239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337.

The product of its digits is 163296, while the sum is 43.

The square root of 78923239 is about 8883.8752242476. The cubic root of 78923239 is about 428.9450233196.

The spelling of 78923239 in words is "seventy-eight million, nine hundred twenty-three thousand, two hundred thirty-nine".