1894164520 has 16 divisors (see below), whose sum is σ = 4261870260. Its totient is φ = 757665792.

The previous prime is 1894164479. The next prime is 1894164521. The reversal of 1894164520 is 254614981.

It can be written as a sum of positive squares in 2 ways, for example, as 1894164484 + 36 = 43522^2 + 6^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 47354113 = 1894164520 / (1 + 8 + 9 + 4 + 1 + 6 + 4 + 5 + 2 + 0).

It is not an unprimeable number, because it can be changed into a prime (1894164521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23677017 + ... + 23677096.

Almost surely, 2^1894164520 is an apocalyptic number.

1894164520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1894164520 is an abundant number, since it is smaller than the sum of its proper divisors (2367705740).

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

1894164520 is a wasteful number, since it uses less digits than its factorization.

1894164520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47354124 (or 47354120 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1894164520 is about 43522.0004135839. Note that the first 3 decimals coincide. The cubic root of 1894164520 is about 1237.2930282707.

The spelling of 1894164520 in words is "one billion, eight hundred ninety-four million, one hundred sixty-four thousand, five hundred twenty".