1978843830 has 32 divisors (see below), whose sum is σ = 4751586144. Its totient is φ = 527429376.

The previous prime is 1978843829. The next prime is 1978843831. The reversal of 1978843830 is 383488791.

It is an interprime number because it is at equal distance from previous prime (1978843829) and next prime (1978843831).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978843831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49272 + ... + 79908.

It is an arithmetic number, because the mean of its divisors is an integer number (148487067).

Almost surely, 2^1978843830 is an apocalyptic number.

1978843830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1978843830 is an abundant number, since it is smaller than the sum of its proper divisors (2772742314).

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

1978843830 is a wasteful number, since it uses less digits than its factorization.

1978843830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32800.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The square root of 1978843830 is about 44484.1975312582. The cubic root of 1978843830 is about 1255.4627754235.

The spelling of 1978843830 in words is "one billion, nine hundred seventy-eight million, eight hundred forty-three thousand, eight hundred thirty".