139881447 has 12 divisors (see below), whose sum is σ = 206350560. Its totient is φ = 91269888.

The previous prime is 139881437. The next prime is 139881449. The reversal of 139881447 is 744188931.

It is a happy number.

It is not a de Polignac number, because 139881447 - 2⁶ = 139881383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139881449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164922 + ... + 165767.

It is an arithmetic number, because the mean of its divisors is an integer number (17195880).

Almost surely, 2^139881447 is an apocalyptic number.

139881447 is a deficient number, since it is larger than the sum of its proper divisors (66469113).

139881447 is a wasteful number, since it uses less digits than its factorization.

139881447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330742 (or 330739 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 139881447 is about 11827.1487265528. The cubic root of 139881447 is about 519.1028007575.

The spelling of 139881447 in words is "one hundred thirty-nine million, eight hundred eighty-one thousand, four hundred forty-seven".