139871477 has 4 divisors (see below), whose sum is σ = 142242240. Its totient is φ = 137500716.

The previous prime is 139871471. The next prime is 139871489. The reversal of 139871477 is 774178931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139871477 - 2¹⁰ = 139870453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139871471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185293 + ... + 1185410.

It is an arithmetic number, because the mean of its divisors is an integer number (35560560).

Almost surely, 2^139871477 is an apocalyptic number.

It is an amenable number.

139871477 is a deficient number, since it is larger than the sum of its proper divisors (2370763).

139871477 is an equidigital number, since it uses as much as digits as its factorization.

139871477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370762.

The product of its digits is 296352, while the sum is 47.

The square root of 139871477 is about 11826.7272311489. The cubic root of 139871477 is about 519.0904675091.

The spelling of 139871477 in words is "one hundred thirty-nine million, eight hundred seventy-one thousand, four hundred seventy-seven".