1721001492 has 60 divisors (see below), whose sum is σ = 5141764320. Its totient is φ = 491714064.

The previous prime is 1721001481. The next prime is 1721001493. The reversal of 1721001492 is 2941001271.

1721001492 is a `hidden beast` number, since 1 + 72 + 100 + 1 + 492 = 666.

It is a super-2 number, since 2×1721001492² = 5923692270932452128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721001493) 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 19 ways as a sum of consecutive naturals, for example, 377142 + ... + 381677.

It is an arithmetic number, because the mean of its divisors is an integer number (85696072).

Almost surely, 2^1721001492 is an apocalyptic number.

1721001492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1721001492 is an abundant number, since it is smaller than the sum of its proper divisors (3420762828).

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

1721001492 is a wasteful number, since it uses less digits than its factorization.

1721001492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758842 (or 758831 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1721001492 is about 41484.9550078098. The cubic root of 1721001492 is about 1198.3777829982.

The spelling of 1721001492 in words is "one billion, seven hundred twenty-one million, one thousand, four hundred ninety-two".