139443387 has 4 divisors (see below), whose sum is σ = 185924520. Its totient is φ = 92962256.

The previous prime is 139443383. The next prime is 139443431. The reversal of 139443387 is 783344931.

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 139443387 - 2² = 139443383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139443383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23240562 + ... + 23240567.

It is an arithmetic number, because the mean of its divisors is an integer number (46481130).

Almost surely, 2^139443387 is an apocalyptic number.

139443387 is a deficient number, since it is larger than the sum of its proper divisors (46481133).

139443387 is an equidigital number, since it uses as much as digits as its factorization.

139443387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46481132.

The product of its digits is 217728, while the sum is 42.

The square root of 139443387 is about 11808.6149484180. The cubic root of 139443387 is about 518.5603510166.

The spelling of 139443387 in words is "one hundred thirty-nine million, four hundred forty-three thousand, three hundred eighty-seven".