139942093 has 4 divisors (see below), whose sum is σ = 140201308. Its totient is φ = 139682880.

The previous prime is 139942073. The next prime is 139942109. The reversal of 139942093 is 390249931.

139942093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 390249931 = 41 ⋅9518291.

It can be written as a sum of positive squares in 2 ways, for example, as 87553449 + 52388644 = 9357^2 + 7238^2 .

It is a cyclic number.

It is not a de Polignac number, because 139942093 - 2¹³ = 139933901 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 (139942043) 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, 128796 + ... + 129877.

It is an arithmetic number, because the mean of its divisors is an integer number (35050327).

Almost surely, 2^139942093 is an apocalyptic number.

It is an amenable number.

139942093 is a deficient number, since it is larger than the sum of its proper divisors (259215).

139942093 is an equidigital number, since it uses as much as digits as its factorization.

139942093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259214.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 139942093 is about 11829.7122957408. The cubic root of 139942093 is about 519.1778094181.

The spelling of 139942093 in words is "one hundred thirty-nine million, nine hundred forty-two thousand, ninety-three".