1921405714 has 16 divisors (see below), whose sum is σ = 3008116440. Its totient is φ = 919584640.

The previous prime is 1921405697. The next prime is 1921405729. The reversal of 1921405714 is 4175041291.

It can be written as a sum of positive squares in 4 ways, for example, as 1432244025 + 489161689 = 37845^2 + 22117^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1921405714.

It is an unprimeable number.

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, 216709 + ... + 225400.

Almost surely, 2^1921405714 is an apocalyptic number.

1921405714 is a deficient number, since it is larger than the sum of its proper divisors (1086710726).

1921405714 is a wasteful number, since it uses less digits than its factorization.

1921405714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442205.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1921405714 is about 43833.8421085809. The cubic root of 1921405714 is about 1243.1962534022.

The spelling of 1921405714 in words is "one billion, nine hundred twenty-one million, four hundred five thousand, seven hundred fourteen".