1978452188 has 24 divisors (see below), whose sum is σ = 3545295600. Its totient is φ = 966065520.

The previous prime is 1978452187. The next prime is 1978452233. The reversal of 1978452188 is 8812548791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978452187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314918 + ... + 321138.

It is an arithmetic number, because the mean of its divisors is an integer number (147720650).

Almost surely, 2^1978452188 is an apocalyptic number.

It is an amenable number.

1978452188 is a deficient number, since it is larger than the sum of its proper divisors (1566843412).

1978452188 is an frugal number, since it uses more digits than its factorization.

1978452188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6354 (or 6266 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 53.

The square root of 1978452188 is about 44479.7952783059. The cubic root of 1978452188 is about 1255.3799451725.

The spelling of 1978452188 in words is "one billion, nine hundred seventy-eight million, four hundred fifty-two thousand, one hundred eighty-eight".