139994425 has 6 divisors (see below), whose sum is σ = 173593118. Its totient is φ = 111995520.

The previous prime is 139994401. The next prime is 139994429. The reversal of 139994425 is 524499931.

It can be written as a sum of positive squares in 3 ways, for example, as 8456464 + 131537961 = 2908^2 + 11469^2 .

It is not a de Polignac number, because 139994425 - 2⁷ = 139994297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139994429) 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 5 ways as a sum of consecutive naturals, for example, 2799864 + ... + 2799913.

Almost surely, 2^139994425 is an apocalyptic number.

It is an amenable number.

139994425 is a deficient number, since it is larger than the sum of its proper divisors (33598693).

139994425 is an equidigital number, since it uses as much as digits as its factorization.

139994425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5599787 (or 5599782 counting only the distinct ones).

The product of its digits is 349920, while the sum is 46.

The square root of 139994425 is about 11831.9239771053. The cubic root of 139994425 is about 519.2425176759.

The spelling of 139994425 in words is "one hundred thirty-nine million, nine hundred ninety-four thousand, four hundred twenty-five".