139748291 has 4 divisors (see below), whose sum is σ = 140117400. Its totient is φ = 139379184.

The previous prime is 139748269. The next prime is 139748309. The reversal of 139748291 is 192847931.

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 139748291 - 2¹⁸ = 139486147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139748251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183986 + ... + 184743.

It is an arithmetic number, because the mean of its divisors is an integer number (35029350).

Almost surely, 2^139748291 is an apocalyptic number.

139748291 is a deficient number, since it is larger than the sum of its proper divisors (369109).

139748291 is an equidigital number, since it uses as much as digits as its factorization.

139748291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369108.

The product of its digits is 108864, while the sum is 44.

The square root of 139748291 is about 11821.5181343176. The cubic root of 139748291 is about 518.9380336198.

The spelling of 139748291 in words is "one hundred thirty-nine million, seven hundred forty-eight thousand, two hundred ninety-one".