649387 has 4 divisors (see below), whose sum is σ = 666976. Its totient is φ = 631800.

The previous prime is 649381. The next prime is 649403. The reversal of 649387 is 783946.

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 649387 - 2³ = 649379 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 17551 = 649387 / (6 + 4 + 9 + 3 + 8 + 7).

It is a d-powerful number, because it can be written as 6³ + 4³ + 3¹² + 9 + 8 + 7⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649381) 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, 8739 + ... + 8812.

It is an arithmetic number, because the mean of its divisors is an integer number (166744).

2⁶⁴⁹³⁸⁷ is an apocalyptic number.

649387 is a deficient number, since it is larger than the sum of its proper divisors (17589).

649387 is a wasteful number, since it uses less digits than its factorization.

649387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17588.

The product of its digits is 36288, while the sum is 37.

The square root of 649387 is about 805.8455186945. The cubic root of 649387 is about 86.5966709656.

The spelling of 649387 in words is "six hundred forty-nine thousand, three hundred eighty-seven".