139926405 has 48 divisors (see below), whose sum is σ = 245374272. Its totient is φ = 67852800.

The previous prime is 139926403. The next prime is 139926419. The reversal of 139926405 is 504629931.

It is not a de Polignac number, because 139926405 - 2¹ = 139926403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139926401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 244770 + ... + 245340.

It is an arithmetic number, because the mean of its divisors is an integer number (5111964).

Almost surely, 2^139926405 is an apocalyptic number.

139926405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139926405 is a deficient number, since it is larger than the sum of its proper divisors (105447867).

139926405 is a wasteful number, since it uses less digits than its factorization.

139926405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 139926405 is about 11829.0492010136. The cubic root of 139926405 is about 519.1584081413.

The spelling of 139926405 in words is "one hundred thirty-nine million, nine hundred twenty-six thousand, four hundred five".