639340269 has 8 divisors (see below), whose sum is σ = 889516992. Its totient is φ = 407695200.

The previous prime is 639340259. The next prime is 639340271. The reversal of 639340269 is 962043936.

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

It is not a de Polignac number, because 639340269 - 2¹¹ = 639338221 is a prime.

It is a super-2 number, since 2×639340269² = 817511959129984722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639340269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639340259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4632832 + ... + 4632969.

It is an arithmetic number, because the mean of its divisors is an integer number (111189624).

Almost surely, 2^639340269 is an apocalyptic number.

639340269 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

639340269 is a deficient number, since it is larger than the sum of its proper divisors (250176723).

639340269 is a wasteful number, since it uses less digits than its factorization.

639340269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9265827.

The product of its (nonzero) digits is 209952, while the sum is 42.

The square root of 639340269 is about 25285.1788405777. The cubic root of 639340269 is about 861.4776601750.

The spelling of 639340269 in words is "six hundred thirty-nine million, three hundred forty thousand, two hundred sixty-nine".