139893561 has 40 divisors (see below), whose sum is σ = 232958880. Its totient is φ = 83140992.

The previous prime is 139893539. The next prime is 139893563. The reversal of 139893561 is 165398931.

139893561 is a `hidden beast` number, since 1 + 3 + 9 + 89 + 3 + 561 = 666.

139893561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139893561 - 2¹⁰ = 139892537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139893563) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23490 + ... + 28836.

It is an arithmetic number, because the mean of its divisors is an integer number (5823972).

Almost surely, 2^139893561 is an apocalyptic number.

It is an amenable number.

139893561 is a deficient number, since it is larger than the sum of its proper divisors (93065319).

139893561 is a wasteful number, since it uses less digits than its factorization.

139893561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395 (or 5386 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 139893561 is about 11827.6608422798. The cubic root of 139893561 is about 519.1177854224.

The spelling of 139893561 in words is "one hundred thirty-nine million, eight hundred ninety-three thousand, five hundred sixty-one".