649340439 has 16 divisors (see below), whose sum is σ = 985561344. Its totient is φ = 376428800.

The previous prime is 649340437. The next prime is 649340443. The reversal of 649340439 is 934043946.

It is not a de Polignac number, because 649340439 - 2¹ = 649340437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649340439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649340431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427002 + ... + 428519.

It is an arithmetic number, because the mean of its divisors is an integer number (61597584).

Almost surely, 2^649340439 is an apocalyptic number.

649340439 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

649340439 is a deficient number, since it is larger than the sum of its proper divisors (336220905).

649340439 is a wasteful number, since it uses less digits than its factorization.

649340439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855558.

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 649340439 is about 25482.1592295472. The cubic root of 649340439 is about 865.9460125785.

The spelling of 649340439 in words is "six hundred forty-nine million, three hundred forty thousand, four hundred thirty-nine".