139995945 has 24 divisors (see below), whose sum is σ = 251649216. Its totient is φ = 74663856.

The previous prime is 139995943. The next prime is 139995959. The reversal of 139995945 is 549599931.

It is not a de Polignac number, because 139995945 - 2¹ = 139995943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139995891 and 139995900.

It is not an unprimeable number, because it can be changed into a prime (139995941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56397 + ... + 58826.

It is an arithmetic number, because the mean of its divisors is an integer number (10485384).

Almost surely, 2^139995945 is an apocalyptic number.

139995945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139995945 is a deficient number, since it is larger than the sum of its proper divisors (111653271).

139995945 is an equidigital number, since it uses as much as digits as its factorization.

139995945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115243 (or 115231 counting only the distinct ones).

The product of its digits is 1968300, while the sum is 54.

The square root of 139995945 is about 11831.9882099333. The cubic root of 139995945 is about 519.2443969073.

It can be divided in two parts, 1399 and 95945, that added together give a square (97344 = 312²).

The spelling of 139995945 in words is "one hundred thirty-nine million, nine hundred ninety-five thousand, nine hundred forty-five".