1992346440 has 128 divisors (see below), whose sum is σ = 7051345920. Its totient is φ = 440697600.

The previous prime is 1992346427. The next prime is 1992346469. The reversal of 1992346440 is 446432991.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1992346392 and 1992346401.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12216 + ... + 64295.

It is an arithmetic number, because the mean of its divisors is an integer number (55088640).

Almost surely, 2^1992346440 is an apocalyptic number.

1992346440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1992346440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3525672960).

1992346440 is an abundant number, since it is smaller than the sum of its proper divisors (5058999480).

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

1992346440 is a wasteful number, since it uses less digits than its factorization.

1992346440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76563 (or 76559 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 1992346440 is about 44635.7081270142. The cubic root of 1992346440 is about 1258.3118485677.

The spelling of 1992346440 in words is "one billion, nine hundred ninety-two million, three hundred forty-six thousand, four hundred forty".