139851 has 12 divisors (see below), whose sum is σ = 207480. Its totient is φ = 90720.

The previous prime is 139837. The next prime is 139861. The reversal of 139851 is 158931.

It is not a de Polignac number, because 139851 - 2⁶ = 139787 is a prime.

It is a super-3 number, since 3×139851³ = 8205744363336153, which contains 333 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

139851 is a lucky number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139851.

It is not an unprimeable number, because it can be changed into a prime (139801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180 + ... + 558.

It is an arithmetic number, because the mean of its divisors is an integer number (17290).

2¹³⁹⁸⁵¹ is an apocalyptic number.

139851 is a deficient number, since it is larger than the sum of its proper divisors (67629).

139851 is a wasteful number, since it uses less digits than its factorization.

139851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 423 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 139851 is about 373.9665760466. The cubic root of 139851 is about 51.9065134886.

It can be divided in two parts, 139 and 851, that added together give a triangular number (990 = T₄₄).

The spelling of 139851 in words is "one hundred thirty-nine thousand, eight hundred fifty-one".