1992351640 has 16 divisors (see below), whose sum is σ = 4482791280. Its totient is φ = 796940640.

The previous prime is 1992351631. The next prime is 1992351643. The reversal of 1992351640 is 461532991.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 49808791 = 1992351640 / (1 + 9 + 9 + 2 + 3 + 5 + 1 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1992351593 and 1992351602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1992351643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24904356 + ... + 24904435.

It is an arithmetic number, because the mean of its divisors is an integer number (280174455).

Almost surely, 2^1992351640 is an apocalyptic number.

1992351640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1992351640 is an abundant number, since it is smaller than the sum of its proper divisors (2490439640).

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

1992351640 is a wasteful number, since it uses less digits than its factorization.

1992351640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49808802 (or 49808798 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 1992351640 is about 44635.7663763041. The cubic root of 1992351640 is about 1258.3129432929.

It can be divided in two parts, 1992351 and 640, that added together give a palindrome (1992991).

The spelling of 1992351640 in words is "one billion, nine hundred ninety-two million, three hundred fifty-one thousand, six hundred forty".