79978043 has 2 divisors, whose sum is σ = 79978044. Its totient is φ = 79978042.

The previous prime is 79978001. The next prime is 79978051. The reversal of 79978043 is 34087997.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79978043 - 2¹⁸ = 79715899 is a prime.

It is not a weakly prime, because it can be changed into another prime (79972043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39989021 + 39989022.

It is an arithmetic number, because the mean of its divisors is an integer number (39989022).

Almost surely, 2^79978043 is an apocalyptic number.

79978043 is a deficient number, since it is larger than the sum of its proper divisors (1).

79978043 is an equidigital number, since it uses as much as digits as its factorization.

79978043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 79978043 is about 8943.0443921519. The cubic root of 79978043 is about 430.8475136306.

The spelling of 79978043 in words is "seventy-nine million, nine hundred seventy-eight thousand, forty-three".