1378945692 has 18 divisors (see below), whose sum is σ = 3485668368. Its totient is φ = 459648552.

The previous prime is 1378945639. The next prime is 1378945697. The reversal of 1378945692 is 2965498731.

1378945692 is a `hidden beast` number, since 1 + 3 + 78 + 9 + 4 + 569 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378945697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19151988 + ... + 19152059.

Almost surely, 2^1378945692 is an apocalyptic number.

1378945692 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1378945692 is an abundant number, since it is smaller than the sum of its proper divisors (2106722676).

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

1378945692 is a wasteful number, since it uses less digits than its factorization.

1378945692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38304057 (or 38304052 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 1378945692 is about 37134.1580219614. The cubic root of 1378945692 is about 1113.0526828738.

The spelling of 1378945692 in words is "one billion, three hundred seventy-eight million, nine hundred forty-five thousand, six hundred ninety-two".