139293823 has 2 divisors, whose sum is σ = 139293824. Its totient is φ = 139293822.

The previous prime is 139293809. The next prime is 139293839. The reversal of 139293823 is 328392931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139293823 - 2²¹ = 137196671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139293893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69646911 + 69646912.

It is an arithmetic number, because the mean of its divisors is an integer number (69646912).

Almost surely, 2^139293823 is an apocalyptic number.

139293823 is a deficient number, since it is larger than the sum of its proper divisors (1).

139293823 is an equidigital number, since it uses as much as digits as its factorization.

139293823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 40.

The square root of 139293823 is about 11802.2804152418. The cubic root of 139293823 is about 518.3748857714.

The spelling of 139293823 in words is "one hundred thirty-nine million, two hundred ninety-three thousand, eight hundred twenty-three".