1999022040 has 192 divisors, whose sum is σ = 6638448960. Its totient is φ = 521579520.

The previous prime is 1999022017. The next prime is 1999022071. The reversal of 1999022040 is 402209991.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1999021986 and 1999022004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5035122 + ... + 5035518.

It is an arithmetic number, because the mean of its divisors is an integer number (34575255).

Almost surely, 2^1999022040 is an apocalyptic number.

1999022040 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 1999022040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3319224480).

1999022040 is an abundant number, since it is smaller than the sum of its proper divisors (4639426920).

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

1999022040 is a wasteful number, since it uses less digits than its factorization.

1999022040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 675 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1999022040 is about 44710.4242878548. The cubic root of 1999022040 is about 1259.7156576820.

The spelling of 1999022040 in words is "one billion, nine hundred ninety-nine million, twenty-two thousand, forty".