139797 has 18 divisors (see below), whose sum is σ = 235638. Its totient is φ = 79632.

The previous prime is 139787. The next prime is 139801. The reversal of 139797 is 797931.

It can be written as a sum of positive squares in only one way, i.e., 86436 + 53361 = 294^2 + 231^2 .

It is not a de Polignac number, because 139797 - 2¹² = 135701 is a prime.

It is a nude number because it is divisible by every one of its digits.

139797 is a lucky number.

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 139797.

It is not an unprimeable number, because it can be changed into a prime (139747) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 283 + ... + 599.

It is an arithmetic number, because the mean of its divisors is an integer number (13091).

2¹³⁹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

139797 is a deficient number, since it is larger than the sum of its proper divisors (95841).

139797 is a wasteful number, since it uses less digits than its factorization.

139797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 327 counting only the distinct ones).

The product of its digits is 11907, while the sum is 36.

The square root of 139797 is about 373.8943701101. The cubic root of 139797 is about 51.8998318237.

The spelling of 139797 in words is "one hundred thirty-nine thousand, seven hundred ninety-seven".