139956285 has 16 divisors (see below), whose sum is σ = 255920256. Its totient is φ = 63979968.

The previous prime is 139956283. The next prime is 139956287. The reversal of 139956285 is 582659931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (139956283) and next prime (139956287).

It is not a de Polignac number, because 139956285 - 2¹ = 139956283 is a prime.

It is a super-2 number, since 2×139956285² = 39175523422002450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139956281) 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 15 ways as a sum of consecutive naturals, for example, 666354 + ... + 666563.

It is an arithmetic number, because the mean of its divisors is an integer number (15995016).

Almost surely, 2^139956285 is an apocalyptic number.

139956285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139956285 is a deficient number, since it is larger than the sum of its proper divisors (115963971).

139956285 is a wasteful number, since it uses less digits than its factorization.

139956285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332932.

The product of its digits is 583200, while the sum is 48.

The square root of 139956285 is about 11830.3121260599. The cubic root of 139956285 is about 519.1953593495.

The spelling of 139956285 in words is "one hundred thirty-nine million, nine hundred fifty-six thousand, two hundred eighty-five".