139838401 has 4 divisors (see below), whose sum is σ = 141280132. Its totient is φ = 138396672.

The previous prime is 139838393. The next prime is 139838441. The reversal of 139838401 is 104838931.

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 46908801 + 92929600 = 6849^2 + 9640^2 .

It is a cyclic number.

It is not a de Polignac number, because 139838401 - 2³ = 139838393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139838441) 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, 720720 + ... + 720913.

It is an arithmetic number, because the mean of its divisors is an integer number (35320033).

Almost surely, 2^139838401 is an apocalyptic number.

It is an amenable number.

139838401 is a deficient number, since it is larger than the sum of its proper divisors (1441731).

139838401 is an equidigital number, since it uses as much as digits as its factorization.

139838401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441730.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 139838401 is about 11825.3287903550. The cubic root of 139838401 is about 519.0495471104.

The spelling of 139838401 in words is "one hundred thirty-nine million, eight hundred thirty-eight thousand, four hundred one".