139644999 has 16 divisors (see below), whose sum is σ = 222796000. Its totient is φ = 85935168.

The previous prime is 139644991. The next prime is 139645007. The reversal of 139644999 is 999446931.

It is an interprime number because it is at equal distance from previous prime (139644991) and next prime (139645007).

It is not a de Polignac number, because 139644999 - 2³ = 139644991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139644991) 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 15 ways as a sum of consecutive naturals, for example, 198574 + ... + 199275.

It is an arithmetic number, because the mean of its divisors is an integer number (13924750).

Almost surely, 2^139644999 is an apocalyptic number.

139644999 is a deficient number, since it is larger than the sum of its proper divisors (83151001).

139644999 is a wasteful number, since it uses less digits than its factorization.

139644999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397871 (or 397865 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 139644999 is about 11817.1485139182. The cubic root of 139644999 is about 518.8101480748.

The spelling of 139644999 in words is "one hundred thirty-nine million, six hundred forty-four thousand, nine hundred ninety-nine".