139865481 has 32 divisors (see below), whose sum is σ = 238714880. Its totient is φ = 79280208.

The previous prime is 139865449. The next prime is 139865503. The reversal of 139865481 is 184568931.

139865481 is a `hidden beast` number, since 13 + 98 + 6 + 548 + 1 = 666.

It is not a de Polignac number, because 139865481 - 2⁵ = 139865449 is a prime.

It is a super-2 number, since 2×139865481² = 39124705550722722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139865431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21090 + ... + 26916.

It is an arithmetic number, because the mean of its divisors is an integer number (7459840).

Almost surely, 2^139865481 is an apocalyptic number.

It is an amenable number.

139865481 is a deficient number, since it is larger than the sum of its proper divisors (98849399).

139865481 is a wasteful number, since it uses less digits than its factorization.

139865481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5970 (or 5964 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 139865481 is about 11826.4737348036. The cubic root of 139865481 is about 519.0830499594.

The spelling of 139865481 in words is "one hundred thirty-nine million, eight hundred sixty-five thousand, four hundred eighty-one".