139215643 has 4 divisors (see below), whose sum is σ = 159103600. Its totient is φ = 119327688.

The previous prime is 139215613. The next prime is 139215647. The reversal of 139215643 is 346512931.

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 139215643 - 2¹³ = 139207451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139215599 and 139215608.

It is not an unprimeable number, because it can be changed into a prime (139215647) 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, 9943968 + ... + 9943981.

It is an arithmetic number, because the mean of its divisors is an integer number (39775900).

Almost surely, 2^139215643 is an apocalyptic number.

139215643 is a deficient number, since it is larger than the sum of its proper divisors (19887957).

139215643 is an equidigital number, since it uses as much as digits as its factorization.

139215643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19887956.

The product of its digits is 19440, while the sum is 34.

The square root of 139215643 is about 11798.9678785901. The cubic root of 139215643 is about 518.2778866558.

The spelling of 139215643 in words is "one hundred thirty-nine million, two hundred fifteen thousand, six hundred forty-three".