139635243 has 12 divisors (see below), whose sum is σ = 220031448. Its totient is φ = 84627360.

The previous prime is 139635239. The next prime is 139635257. The reversal of 139635243 is 342536931.

It is a happy number.

139635243 is a `hidden beast` number, since 13 + 9 + 635 + 2 + 4 + 3 = 666.

It is not a de Polignac number, because 139635243 - 2² = 139635239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139635198 and 139635207.

It is not an unprimeable number, because it can be changed into a prime (139635043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 705130 + ... + 705327.

It is an arithmetic number, because the mean of its divisors is an integer number (18335954).

Almost surely, 2^139635243 is an apocalyptic number.

139635243 is a deficient number, since it is larger than the sum of its proper divisors (80396205).

139635243 is a wasteful number, since it uses less digits than its factorization.

139635243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410474 (or 1410471 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 139635243 is about 11816.7357167705. The cubic root of 139635243 is about 518.7980659386.

The spelling of 139635243 in words is "one hundred thirty-nine million, six hundred thirty-five thousand, two hundred forty-three".