1868269840 has 20 divisors (see below), whose sum is σ = 4343727564. Its totient is φ = 747307904.

The previous prime is 1868269817. The next prime is 1868269841. The reversal of 1868269840 is 489628681.

It can be written as a sum of positive squares in 2 ways, for example, as 334450944 + 1533818896 = 18288^2 + 39164^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1868269841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11676607 + ... + 11676766.

Almost surely, 2^1868269840 is an apocalyptic number.

1868269840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1868269840 is an abundant number, since it is smaller than the sum of its proper divisors (2475457724).

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

1868269840 is a wasteful number, since it uses less digits than its factorization.

1868269840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23353386 (or 23353380 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 52.

The square root of 1868269840 is about 43223.4871337332. The cubic root of 1868269840 is about 1231.6288904444.

The spelling of 1868269840 in words is "one billion, eight hundred sixty-eight million, two hundred sixty-nine thousand, eight hundred forty".