1662820398 has 48 divisors (see below), whose sum is σ = 3639707136. Its totient is φ = 548614080.

The previous prime is 1662820387. The next prime is 1662820399. The reversal of 1662820398 is 8930282661.

1662820398 is a `hidden beast` number, since 16 + 628 + 2 + 0 + 3 + 9 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662820399) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1766608 + ... + 1767548.

It is an arithmetic number, because the mean of its divisors is an integer number (75827232).

Almost surely, 2^1662820398 is an apocalyptic number.

1662820398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1662820398 is an abundant number, since it is smaller than the sum of its proper divisors (1976886738).

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

1662820398 is a wasteful number, since it uses less digits than its factorization.

1662820398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849 (or 1846 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1662820398 is about 40777.6948588318. The cubic root of 1662820398 is about 1184.7183478459.

The spelling of 1662820398 in words is "one billion, six hundred sixty-two million, eight hundred twenty thousand, three hundred ninety-eight".