1978438914 has 24 divisors (see below), whose sum is σ = 4402473660. Its totient is φ = 641655648.

The previous prime is 1978438871. The next prime is 1978438933. The reversal of 1978438914 is 4198348791.

1978438914 is a `hidden beast` number, since 197 + 8 + 438 + 9 + 14 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1844273025 + 134165889 = 42945^2 + 11583^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1484649 + ... + 1485980.

Almost surely, 2^1978438914 is an apocalyptic number.

1978438914 is an abundant number, since it is smaller than the sum of its proper divisors (2424034746).

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

1978438914 is a wasteful number, since it uses less digits than its factorization.

1978438914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2970674 (or 2970671 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 1978438914 is about 44479.6460642393. The cubic root of 1978438914 is about 1255.3771375989.

The spelling of 1978438914 in words is "one billion, nine hundred seventy-eight million, four hundred thirty-eight thousand, nine hundred fourteen".