1921329418 has 8 divisors (see below), whose sum is σ = 2882257380. Its totient is φ = 960576960.

The previous prime is 1921329407. The next prime is 1921329427. The reversal of 1921329418 is 8149231291.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1917301369 + 4028049 = 43787^2 + 2007^2 .

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, 11823 + ... + 63106.

Almost surely, 2^1921329418 is an apocalyptic number.

1921329418 is a deficient number, since it is larger than the sum of its proper divisors (960927962).

1921329418 is a wasteful number, since it uses less digits than its factorization.

1921329418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87752.

The product of its digits is 31104, while the sum is 40.

The square root of 1921329418 is about 43832.9718134648. The cubic root of 1921329418 is about 1243.1797980615.

The spelling of 1921329418 in words is "one billion, nine hundred twenty-one million, three hundred twenty-nine thousand, four hundred eighteen".