139903523 has 4 divisors (see below), whose sum is σ = 148133160. Its totient is φ = 131673888.

The previous prime is 139903513. The next prime is 139903529. The reversal of 139903523 is 325309931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139903523 - 2⁴ = 139903507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139903529) 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 3 ways as a sum of consecutive naturals, for example, 4114793 + ... + 4114826.

It is an arithmetic number, because the mean of its divisors is an integer number (37033290).

Almost surely, 2^139903523 is an apocalyptic number.

139903523 is a deficient number, since it is larger than the sum of its proper divisors (8229637).

139903523 is an equidigital number, since it uses as much as digits as its factorization.

139903523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8229636.

The product of its (nonzero) digits is 21870, while the sum is 35.

The square root of 139903523 is about 11828.0819662361. The cubic root of 139903523 is about 519.1301074778.

The spelling of 139903523 in words is "one hundred thirty-nine million, nine hundred three thousand, five hundred twenty-three".