639253145 has 16 divisors (see below), whose sum is σ = 806585472. Its totient is φ = 485422080.

The previous prime is 639253133. The next prime is 639253169. The reversal of 639253145 is 541352936.

It is not a de Polignac number, because 639253145 - 2¹⁴ = 639236761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639253099 and 639253108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6152 + ... + 36281.

It is an arithmetic number, because the mean of its divisors is an integer number (50411592).

Almost surely, 2^639253145 is an apocalyptic number.

It is an amenable number.

639253145 is a deficient number, since it is larger than the sum of its proper divisors (167332327).

639253145 is a wasteful number, since it uses less digits than its factorization.

639253145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42592.

The product of its digits is 97200, while the sum is 38.

The square root of 639253145 is about 25283.4559544379. The cubic root of 639253145 is about 861.4385267156.

The spelling of 639253145 in words is "six hundred thirty-nine million, two hundred fifty-three thousand, one hundred forty-five".