139537845 has 24 divisors (see below), whose sum is σ = 242172216. Its totient is φ = 74325888.

The previous prime is 139537837. The next prime is 139537847. The reversal of 139537845 is 548735931.

139537845 is a `hidden beast` number, since 1 + 39 + 537 + 84 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16793604 + 122744241 = 4098^2 + 11079^2 .

It is not a de Polignac number, because 139537845 - 2³ = 139537837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 139537845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139537847) 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 23 ways as a sum of consecutive naturals, for example, 47767 + ... + 50603.

It is an arithmetic number, because the mean of its divisors is an integer number (10090509).

Almost surely, 2^139537845 is an apocalyptic number.

139537845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139537845 is a deficient number, since it is larger than the sum of its proper divisors (102634371).

139537845 is a wasteful number, since it uses less digits than its factorization.

139537845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941 (or 3938 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 139537845 is about 11812.6138089756. The cubic root of 139537845 is about 518.6774143371.

The spelling of 139537845 in words is "one hundred thirty-nine million, five hundred thirty-seven thousand, eight hundred forty-five".