6139987 has 8 divisors (see below), whose sum is σ = 7046496. Its totient is φ = 5240832.

The previous prime is 6139979. The next prime is 6139993. The reversal of 6139987 is 7899316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6139987 - 2³ = 6139979 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 1 + 3¹⁴ + 9³ + 9⁶ + 8 + 7⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6139937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93 + ... + 3505.

It is an arithmetic number, because the mean of its divisors is an integer number (880812).

Almost surely, 2^6139987 is an apocalyptic number.

6139987 is a deficient number, since it is larger than the sum of its proper divisors (906509).

6139987 is a wasteful number, since it uses less digits than its factorization.

6139987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3677.

The product of its digits is 81648, while the sum is 43.

The square root of 6139987 is about 2477.8997154849. The cubic root of 6139987 is about 183.1143939234.

The spelling of 6139987 in words is "six million, one hundred thirty-nine thousand, nine hundred eighty-seven".