1878638 has 16 divisors (see below), whose sum is σ = 2954880. Its totient is φ = 894816.

The previous prime is 1878629. The next prime is 1878641. The reversal of 1878638 is 8368781.

It is a junction number, because it is equal to n+sod(n) for n = 1878595 and 1878604.

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, 3683 + ... + 4161.

It is an arithmetic number, because the mean of its divisors is an integer number (184680).

2^1878638 is an apocalyptic number.

1878638 is a deficient number, since it is larger than the sum of its proper divisors (1076242).

1878638 is a wasteful number, since it uses less digits than its factorization.

1878638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571.

The product of its digits is 64512, while the sum is 41.

The square root of 1878638 is about 1370.6341597961. The cubic root of 1878638 is about 123.3903040101.

The spelling of 1878638 in words is "one million, eight hundred seventy-eight thousand, six hundred thirty-eight".