1978293512 has 16 divisors (see below), whose sum is σ = 3994631340. Its totient is φ = 913058496.

The previous prime is 1978293491. The next prime is 1978293517. The reversal of 1978293512 is 2153928791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1889293156 + 89000356 = 43466^2 + 9434^2 .

It is not an unprimeable number, because it can be changed into a prime (1978293517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9510923 + ... + 9511130.

Almost surely, 2^1978293512 is an apocalyptic number.

It is an amenable number.

1978293512 is an abundant number, since it is smaller than the sum of its proper divisors (2016337828).

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

1978293512 is a wasteful number, since it uses less digits than its factorization.

1978293512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19022072 (or 19022068 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The square root of 1978293512 is about 44478.0115562735. The cubic root of 1978293512 is about 1255.3463829102.

The spelling of 1978293512 in words is "one billion, nine hundred seventy-eight million, two hundred ninety-three thousand, five hundred twelve".