1721079490 has 32 divisors (see below), whose sum is σ = 3532500720. Its totient is φ = 598093824.

The previous prime is 1721079461. The next prime is 1721079497. The reversal of 1721079490 is 949701271.

It can be written as a sum of positive squares in 8 ways, for example, as 298356529 + 1422722961 = 17273^2 + 37719^2 .

It is a super-2 number, since 2×1721079490² = 5924229221797320200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1721079497) 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, 387175 + ... + 391594.

Almost surely, 2^1721079490 is an apocalyptic number.

1721079490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1721079490 is an abundant number, since it is smaller than the sum of its proper divisors (1811421230).

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

1721079490 is a wasteful number, since it uses less digits than its factorization.

1721079490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778806.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 1721079490 is about 41485.8950729040. The cubic root of 1721079490 is about 1198.3958867319.

The spelling of 1721079490 in words is "one billion, seven hundred twenty-one million, seventy-nine thousand, four hundred ninety".