1921668410 has 8 divisors (see below), whose sum is σ = 3459003156. Its totient is φ = 768667360.

The previous prime is 1921668403. The next prime is 1921668433. The reversal of 1921668410 is 148661291.

It can be written as a sum of positive squares in 2 ways, for example, as 1776538201 + 145130209 = 42149^2 + 12047^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96083411 + ... + 96083430.

Almost surely, 2^1921668410 is an apocalyptic number.

1921668410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1921668410 is a deficient number, since it is larger than the sum of its proper divisors (1537334746).

1921668410 is a wasteful number, since it uses less digits than its factorization.

1921668410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192166848.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1921668410 is about 43836.8385037060. The cubic root of 1921668410 is about 1243.2529077219.

The spelling of 1921668410 in words is "one billion, nine hundred twenty-one million, six hundred sixty-eight thousand, four hundred ten".