1897938280 has 32 divisors (see below), whose sum is σ = 4880413440. Its totient is φ = 650721600.

The previous prime is 1897938247. The next prime is 1897938313. The reversal of 1897938280 is 828397981.

It is an interprime number because it is at equal distance from previous prime (1897938247) and next prime (1897938313).

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3388896 + ... + 3389455.

It is an arithmetic number, because the mean of its divisors is an integer number (152512920).

Almost surely, 2^1897938280 is an apocalyptic number.

1897938280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897938280 is an abundant number, since it is smaller than the sum of its proper divisors (2982475160).

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

1897938280 is a wasteful number, since it uses less digits than its factorization.

1897938280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6778369 (or 6778365 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The square root of 1897938280 is about 43565.3334659566. Note that the first 3 decimals coincide. The cubic root of 1897938280 is about 1238.1141729771.

The spelling of 1897938280 in words is "one billion, eight hundred ninety-seven million, nine hundred thirty-eight thousand, two hundred eighty".