139869 has 6 divisors (see below), whose sum is σ = 202046. Its totient is φ = 93240.

The previous prime is 139861. The next prime is 139871. The reversal of 139869 is 968931.

It can be written as a sum of positive squares in only one way, i.e., 131769 + 8100 = 363^2 + 90^2 .

It is not a de Polignac number, because 139869 - 2³ = 139861 is a prime.

It is a super-2 number, since 2×139869² = 39126674322, which contains 22 as substring.

It is a Duffinian number.

139869 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139869.

It is not an unprimeable number, because it can be changed into a prime (139861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7762 + ... + 7779.

2¹³⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

139869 is a deficient number, since it is larger than the sum of its proper divisors (62177).

139869 is a wasteful number, since it uses less digits than its factorization.

139869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15547 (or 15544 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 139869 is about 373.9906415941. The cubic root of 139869 is about 51.9087403280.

The spelling of 139869 in words is "one hundred thirty-nine thousand, eight hundred sixty-nine".