1985278092 has 48 divisors (see below), whose sum is σ = 5302402560. Its totient is φ = 566330112.

The previous prime is 1985278091. The next prime is 1985278093. The reversal of 1985278092 is 2908725891.

It is an interprime number because it is at equal distance from previous prime (1985278091) and next prime (1985278093).

It is not an unprimeable number, because it can be changed into a prime (1985278091) 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, 36084 + ... + 72612.

It is an arithmetic number, because the mean of its divisors is an integer number (110466720).

Almost surely, 2^1985278092 is an apocalyptic number.

1985278092 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1985278092 is an abundant number, since it is smaller than the sum of its proper divisors (3317124468).

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

1985278092 is a wasteful number, since it uses less digits than its factorization.

1985278092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37190 (or 37188 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 1985278092 is about 44556.4595990301. The cubic root of 1985278092 is about 1256.8220265238.

The spelling of 1985278092 in words is "one billion, nine hundred eighty-five million, two hundred seventy-eight thousand, ninety-two".