1638598396 has 12 divisors (see below), whose sum is σ = 2869167952. Its totient is φ = 818836128.

The previous prime is 1638598393. The next prime is 1638598411. The reversal of 1638598396 is 6938958361.

It is a self number, because there is not a number n which added to its sum of digits gives 1638598396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638598393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107745 + ... + 122008.

Almost surely, 2^1638598396 is an apocalyptic number.

It is an amenable number.

1638598396 is a deficient number, since it is larger than the sum of its proper divisors (1230569556).

1638598396 is a wasteful number, since it uses less digits than its factorization.

1638598396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231540 (or 231538 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 58.

The square root of 1638598396 is about 40479.6046917457. The cubic root of 1638598396 is about 1178.9376620918.

The spelling of 1638598396 in words is "one billion, six hundred thirty-eight million, five hundred ninety-eight thousand, three hundred ninety-six".