1938638 has 16 divisors (see below), whose sum is σ = 3157056. Its totient is φ = 887520.

The previous prime is 1938637. The next prime is 1938659. The reversal of 1938638 is 8368391.

1938638 = 167² + 168² + ... + 218².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4283 + ... + 4713.

It is an arithmetic number, because the mean of its divisors is an integer number (197316).

2^1938638 is an apocalyptic number.

1938638 is a deficient number, since it is larger than the sum of its proper divisors (1218418).

1938638 is a wasteful number, since it uses less digits than its factorization.

1938638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619.

The product of its digits is 31104, while the sum is 38.

The square root of 1938638 is about 1392.3498123676. The cubic root of 1938638 is about 124.6901767107.

The spelling of 1938638 in words is "one million, nine hundred thirty-eight thousand, six hundred thirty-eight".