640419 has 8 divisors (see below), whose sum is σ = 919632. Its totient is φ = 394080.

The previous prime is 640411. The next prime is 640421. The reversal of 640419 is 914046.

640419 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 640419 - 2³ = 640411 is a prime.

It is a super-2 number, since 2×640419² = 820272991122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640411) 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, 8172 + ... + 8249.

It is an arithmetic number, because the mean of its divisors is an integer number (114954).

2⁶⁴⁰⁴¹⁹ is an apocalyptic number.

640419 is a deficient number, since it is larger than the sum of its proper divisors (279213).

640419 is a wasteful number, since it uses less digits than its factorization.

640419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16437.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 640419 is about 800.2618321525. The cubic root of 640419 is about 86.1961899181.

The spelling of 640419 in words is "six hundred forty thousand, four hundred nineteen".