1378204164 has 18 divisors (see below), whose sum is σ = 3483793950. Its totient is φ = 459401376.

The previous prime is 1378204123. The next prime is 1378204189. The reversal of 1378204164 is 4614028731.

It can be written as a sum of positive squares in only one way, i.e., 1363824900 + 14379264 = 36930^2 + 3792^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 38283449 = 1378204164 / (1 + 3 + 7 + 8 + 2 + 0 + 4 + 1 + 6 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19141689 + ... + 19141760.

Almost surely, 2^1378204164 is an apocalyptic number.

It is an amenable number.

1378204164 is an abundant number, since it is smaller than the sum of its proper divisors (2105589786).

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

1378204164 is a wasteful number, since it uses less digits than its factorization.

1378204164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38283459 (or 38283454 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1378204164 is about 37124.1722331960. The cubic root of 1378204164 is about 1112.8531324190.

The spelling of 1378204164 in words is "one billion, three hundred seventy-eight million, two hundred four thousand, one hundred sixty-four".