1894138378 has 16 divisors (see below), whose sum is σ = 3199484160. Its totient is φ = 833198400.

The previous prime is 1894138369. The next prime is 1894138381. The reversal of 1894138378 is 8738314981.

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, 1387983 + ... + 1389346.

It is an arithmetic number, because the mean of its divisors is an integer number (199967760).

Almost surely, 2^1894138378 is an apocalyptic number.

1894138378 is a deficient number, since it is larger than the sum of its proper divisors (1305345782).

1894138378 is a wasteful number, since it uses less digits than its factorization.

1894138378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777373.

The product of its digits is 1161216, while the sum is 52.

The square root of 1894138378 is about 43521.7000816834. The cubic root of 1894138378 is about 1237.2873361458.

It can be divided in two parts, 189413 and 8378, that added together give a palindrome (197791).

The spelling of 1894138378 in words is "one billion, eight hundred ninety-four million, one hundred thirty-eight thousand, three hundred seventy-eight".