638030492 has 12 divisors (see below), whose sum is σ = 1218058296. Its totient is φ = 290013840.

The previous prime is 638030461. The next prime is 638030521. The reversal of 638030492 is 294030836.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7250303 + ... + 7250390.

It is an arithmetic number, because the mean of its divisors is an integer number (101504858).

Almost surely, 2^638030492 is an apocalyptic number.

It is an amenable number.

638030492 is a deficient number, since it is larger than the sum of its proper divisors (580027804).

638030492 is a wasteful number, since it uses less digits than its factorization.

638030492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14500708 (or 14500706 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 638030492 is about 25259.2654683385. The cubic root of 638030492 is about 860.8889725955. Note that the first 3 decimals are identical.

The spelling of 638030492 in words is "six hundred thirty-eight million, thirty thousand, four hundred ninety-two".