139007639 has 4 divisors (see below), whose sum is σ = 139218600. Its totient is φ = 138796680.

The previous prime is 139007621. The next prime is 139007651. The reversal of 139007639 is 936700931.

139007639 = 87² + 88² + ... + 747².

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 139007639 - 2⁸ = 139007383 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 (139007839) 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, 104489 + ... + 105810.

It is an arithmetic number, because the mean of its divisors is an integer number (34804650).

Almost surely, 2^139007639 is an apocalyptic number.

139007639 is a deficient number, since it is larger than the sum of its proper divisors (210961).

139007639 is an equidigital number, since it uses as much as digits as its factorization.

139007639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210960.

The product of its (nonzero) digits is 30618, while the sum is 38.

The square root of 139007639 is about 11790.1500838624. The cubic root of 139007639 is about 518.0196359635.

The spelling of 139007639 in words is "one hundred thirty-nine million, seven thousand, six hundred thirty-nine".