139827931 has 4 divisors (see below), whose sum is σ = 140665392. Its totient is φ = 138990472.

The previous prime is 139827929. The next prime is 139827953. The reversal of 139827931 is 139728931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139728931 = 29 ⋅4818239.

It is a cyclic number.

It is not a de Polignac number, because 139827931 - 2¹ = 139827929 is a prime.

It is a super-2 number, since 2×139827931² = 39103700575481522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139827911) 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, 418480 + ... + 418813.

It is an arithmetic number, because the mean of its divisors is an integer number (35166348).

Almost surely, 2^139827931 is an apocalyptic number.

139827931 is a deficient number, since it is larger than the sum of its proper divisors (837461).

139827931 is an equidigital number, since it uses as much as digits as its factorization.

139827931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837460.

The product of its digits is 81648, while the sum is 43.

The square root of 139827931 is about 11824.8860882463. The cubic root of 139827931 is about 519.0365926707.

The spelling of 139827931 in words is "one hundred thirty-nine million, eight hundred twenty-seven thousand, nine hundred thirty-one".