1897638 has 16 divisors (see below), whose sum is σ = 3960576. Its totient is φ = 605000.

The previous prime is 1897627. The next prime is 1897639. The reversal of 1897638 is 8367981.

It is a self number, because there is not a number n which added to its sum of digits gives 1897638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897639) 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, 6738 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (247536).

2^1897638 is an apocalyptic number.

1897638 is an abundant number, since it is smaller than the sum of its proper divisors (2062938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1897638 is a wasteful number, since it uses less digits than its factorization.

1897638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13779.

The product of its digits is 72576, while the sum is 42.

The square root of 1897638 is about 1377.5478213115. The cubic root of 1897638 is about 123.8048873956.

The spelling of 1897638 in words is "one million, eight hundred ninety-seven thousand, six hundred thirty-eight".