78500423 has 2 divisors, whose sum is σ = 78500424. Its totient is φ = 78500422.

The previous prime is 78500399. The next prime is 78500437. The reversal of 78500423 is 32400587.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (32400587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78500423 - 2¹⁶ = 78434887 is a prime.

It is a super-3 number, since 3×78500423³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78502423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39250211 + 39250212.

It is an arithmetic number, because the mean of its divisors is an integer number (39250212).

Almost surely, 2^78500423 is an apocalyptic number.

78500423 is a deficient number, since it is larger than the sum of its proper divisors (1).

78500423 is an equidigital number, since it uses as much as digits as its factorization.

78500423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 78500423 is about 8860.0464445735. The cubic root of 78500423 is about 428.1776546530.

The spelling of 78500423 in words is "seventy-eight million, five hundred thousand, four hundred twenty-three".