1801444640 has 96 divisors (see below), whose sum is σ = 4516767360. Its totient is φ = 677484544.

The previous prime is 1801444637. The next prime is 1801444643. The reversal of 1801444640 is 464441081.

It is an interprime number because it is at equal distance from previous prime (1801444637) and next prime (1801444643).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1801444597 and 1801444606.

It is not an unprimeable number, because it can be changed into a prime (1801444643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212972 + ... + 221268.

It is an arithmetic number, because the mean of its divisors is an integer number (47049660).

Almost surely, 2^1801444640 is an apocalyptic number.

1801444640 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 1801444640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2258383680).

1801444640 is an abundant number, since it is smaller than the sum of its proper divisors (2715322720).

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

1801444640 is a wasteful number, since it uses less digits than its factorization.

1801444640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8394 (or 8386 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 1801444640 is about 42443.4287022149. The cubic root of 1801444640 is about 1216.7657414368.

The spelling of 1801444640 in words is "one billion, eight hundred one million, four hundred forty-four thousand, six hundred forty".