1639427049 has 24 divisors (see below), whose sum is σ = 2551640000. Its totient is φ = 1008316512.

The previous prime is 1639427047. The next prime is 1639427129. The reversal of 1639427049 is 9407249361.

It is a happy number.

1639427049 is a `hidden beast` number, since 1 + 639 + 4 + 2 + 7 + 0 + 4 + 9 = 666.

It is not a de Polignac number, because 1639427049 - 2¹ = 1639427047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1639426995 and 1639427013.

It is not an unprimeable number, because it can be changed into a prime (1639427047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325452 + ... + 330450.

Almost surely, 2^1639427049 is an apocalyptic number.

It is an amenable number.

1639427049 is a deficient number, since it is larger than the sum of its proper divisors (912212951).

1639427049 is a wasteful number, since it uses less digits than its factorization.

1639427049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7821 (or 7818 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1639427049 is about 40489.8388364291. The cubic root of 1639427049 is about 1179.1363615003.

The spelling of 1639427049 in words is "one billion, six hundred thirty-nine million, four hundred twenty-seven thousand, forty-nine".