1662409321 has 8 divisors (see below), whose sum is σ = 1668569760. Its totient is φ = 1656260928.

The previous prime is 1662409291. The next prime is 1662409327. The reversal of 1662409321 is 1239042661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1662409321 - 2⁹ = 1662408809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662409327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342705 + ... + 347521.

It is an arithmetic number, because the mean of its divisors is an integer number (208571220).

Almost surely, 2^1662409321 is an apocalyptic number.

It is an amenable number.

1662409321 is a deficient number, since it is larger than the sum of its proper divisors (6160439).

1662409321 is an equidigital number, since it uses as much as digits as its factorization.

1662409321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1662409321 is about 40772.6540833437. The cubic root of 1662409321 is about 1184.6207124061.

It can be divided in two parts, 166240 and 9321, that added together give a square (175561 = 419²).

The spelling of 1662409321 in words is "one billion, six hundred sixty-two million, four hundred nine thousand, three hundred twenty-one".