139965437 has 4 divisors (see below), whose sum is σ = 148198716. Its totient is φ = 131732160.

The previous prime is 139965379. The next prime is 139965439. The reversal of 139965437 is 734569931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103652761 + 36312676 = 10181^2 + 6026^2 .

It is a cyclic number.

It is not a de Polignac number, because 139965437 - 2¹⁸ = 139703293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139965391 and 139965400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139965439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4116614 + ... + 4116647.

It is an arithmetic number, because the mean of its divisors is an integer number (37049679).

Almost surely, 2^139965437 is an apocalyptic number.

139965437 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

139965437 is a deficient number, since it is larger than the sum of its proper divisors (8233279).

139965437 is an equidigital number, since it uses as much as digits as its factorization.

139965437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8233278.

The product of its digits is 612360, while the sum is 47.

The square root of 139965437 is about 11830.6989227180. The cubic root of 139965437 is about 519.2066761507.

The spelling of 139965437 in words is "one hundred thirty-nine million, nine hundred sixty-five thousand, four hundred thirty-seven".