1978299840 has 112 divisors (see below), whose sum is σ = 6852147840. Its totient is φ = 479585280.

The previous prime is 1978299823. The next prime is 1978299857. The reversal of 1978299840 is 489928791.

It is an interprime number because it is at equal distance from previous prime (1978299823) and next prime (1978299857).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83110 + ... + 104229.

Almost surely, 2^1978299840 is an apocalyptic number.

1978299840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978299840 is an abundant number, since it is smaller than the sum of its proper divisors (4873848000).

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

1978299840 is a wasteful number, since it uses less digits than its factorization.

1978299840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187370 (or 187360 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 57.

The square root of 1978299840 is about 44478.0826924902. The cubic root of 1978299840 is about 1255.3477214078.

The spelling of 1978299840 in words is "one billion, nine hundred seventy-eight million, two hundred ninety-nine thousand, eight hundred forty".