649819 has 8 divisors (see below), whose sum is σ = 714240. Its totient is φ = 588456.

The previous prime is 649813. The next prime is 649829. The reversal of 649819 is 918946.

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 649819 - 2⁵ = 649787 is a prime.

It is a super-2 number, since 2×649819² = 844529465522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649813) 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, 307 + ... + 1180.

It is an arithmetic number, because the mean of its divisors is an integer number (89280).

2⁶⁴⁹⁸¹⁹ is an apocalyptic number.

649819 is a deficient number, since it is larger than the sum of its proper divisors (64421).

649819 is a wasteful number, since it uses less digits than its factorization.

649819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529.

The product of its digits is 15552, while the sum is 37.

The square root of 649819 is about 806.1135155795. The cubic root of 649819 is about 86.6158693119.

The spelling of 649819 in words is "six hundred forty-nine thousand, eight hundred nineteen".