1401638 has 16 divisors (see below), whose sum is σ = 2449440. Its totient is φ = 589056.

The previous prime is 1401629. The next prime is 1401641. The reversal of 1401638 is 8361041.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (153090).

2^1401638 is an apocalyptic number.

1401638 is a deficient number, since it is larger than the sum of its proper divisors (1047802).

1401638 is a wasteful number, since it uses less digits than its factorization.

1401638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1401638 is about 1183.9079356099. The cubic root of 1401638 is about 111.9125060727.

Adding to 1401638 its reverse (8361041), we get a palindrome (9762679).

The spelling of 1401638 in words is "one million, four hundred one thousand, six hundred thirty-eight".