1721336140 has 24 divisors (see below), whose sum is σ = 3615654672. Its totient is φ = 688372800.

The previous prime is 1721336129. The next prime is 1721336143. The reversal of 1721336140 is 416331271.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1721336099 and 1721336108.

It is not an unprimeable number, because it can be changed into a prime (1721336143) by changing a digit.

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, 114967 + ... + 129073.

It is an arithmetic number, because the mean of its divisors is an integer number (150652278).

Almost surely, 2^1721336140 is an apocalyptic number.

1721336140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1721336140 is an abundant number, since it is smaller than the sum of its proper divisors (1894318532).

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

1721336140 is a wasteful number, since it uses less digits than its factorization.

1721336140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20217 (or 20215 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1721336140 is about 41488.9881775876. The cubic root of 1721336140 is about 1198.4554526456.

The spelling of 1721336140 in words is "one billion, seven hundred twenty-one million, three hundred thirty-six thousand, one hundred forty".