1663138 has 8 divisors (see below), whose sum is σ = 2511900. Its totient is φ = 825840.

The previous prime is 1663133. The next prime is 1663147. The reversal of 1663138 is 8313661.

It can be written as a sum of positive squares in 2 ways, for example, as 1505529 + 157609 = 1227^2 + 397^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1663133) 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, 2493 + ... + 3088.

2^1663138 is an apocalyptic number.

1663138 is a deficient number, since it is larger than the sum of its proper divisors (848762).

1663138 is a wasteful number, since it uses less digits than its factorization.

1663138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5732.

The product of its digits is 2592, while the sum is 28.

The square root of 1663138 is about 1289.6270778795. The cubic root of 1663138 is about 118.4793770897.

Adding to 1663138 its reverse (8313661), we get a palindrome (9976799).

The spelling of 1663138 in words is "one million, six hundred sixty-three thousand, one hundred thirty-eight".