1642022440 has 32 divisors (see below), whose sum is σ = 3855185280. Its totient is φ = 628251712.

The previous prime is 1642022357. The next prime is 1642022443. The reversal of 1642022440 is 442202461.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1642022443) 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, 891484 + ... + 893323.

It is an arithmetic number, because the mean of its divisors is an integer number (120474540).

Almost surely, 2^1642022440 is an apocalyptic number.

1642022440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642022440 is an abundant number, since it is smaller than the sum of its proper divisors (2213162840).

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

1642022440 is a wasteful number, since it uses less digits than its factorization.

1642022440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784841 (or 1784837 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 1642022440 is about 40521.8760671319. The cubic root of 1642022440 is about 1179.7582670580.

The spelling of 1642022440 in words is "one billion, six hundred forty-two million, twenty-two thousand, four hundred forty".