1802989440 has 384 divisors, whose sum is σ = 7204317120. Its totient is φ = 406978560.

The previous prime is 1802989427. The next prime is 1802989469. The reversal of 1802989440 is 449892081.

1802989440 is a `hidden beast` number, since 180 + 29 + 8 + 9 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 3910810 + ... + 3911270.

Almost surely, 2^1802989440 is an apocalyptic number.

1802989440 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 1802989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3602158560).

1802989440 is an abundant number, since it is smaller than the sum of its proper divisors (5401327680).

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

1802989440 is a wasteful number, since it uses less digits than its factorization.

1802989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1802989440 is about 42461.6231437283. The cubic root of 1802989440 is about 1217.1134480571.

The spelling of 1802989440 in words is "one billion, eight hundred two million, nine hundred eighty-nine thousand, four hundred forty".