640414 has 12 divisors (see below), whose sum is σ = 1014984. Its totient is φ = 303012.

The previous prime is 640411. The next prime is 640421. The reversal of 640414 is 414046.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 640391 and 640400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640411) 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 5 ways as a sum of consecutive naturals, for example, 279 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (84582).

2⁶⁴⁰⁴¹⁴ is an apocalyptic number.

640414 is a deficient number, since it is larger than the sum of its proper divisors (374570).

640414 is a wasteful number, since it uses less digits than its factorization.

640414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 640414 is about 800.2587081688. The cubic root of 640414 is about 86.1959655952.

The spelling of 640414 in words is "six hundred forty thousand, four hundred fourteen".