139916893 has 4 divisors (see below), whose sum is σ = 147280960. Its totient is φ = 132552828.

The previous prime is 139916849. The next prime is 139916897. The reversal of 139916893 is 398619931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 398619931 = 73 ⋅5460547.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139916893 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 (139916897) 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, 3682005 + ... + 3682042.

It is an arithmetic number, because the mean of its divisors is an integer number (36820240).

Almost surely, 2^139916893 is an apocalyptic number.

It is an amenable number.

139916893 is a deficient number, since it is larger than the sum of its proper divisors (7364067).

139916893 is an equidigital number, since it uses as much as digits as its factorization.

139916893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7364066.

The product of its digits is 314928, while the sum is 49.

The square root of 139916893 is about 11828.6471331256. The cubic root of 139916893 is about 519.1466439888.

The spelling of 139916893 in words is "one hundred thirty-nine million, nine hundred sixteen thousand, eight hundred ninety-three".