1000621440 has 768 divisors, whose sum is σ = 4491002880. Its totient is φ = 199507968.

The previous prime is 1000621409. The next prime is 1000621459. The reversal of 1000621440 is 441260001.

1000621440 is a `hidden beast` number, since 1 + 0 + 0 + 0 + 621 + 4 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12055639 + ... + 12055721.

It is an arithmetic number, because the mean of its divisors is an integer number (5847660).

Almost surely, 2^1000621440 is an apocalyptic number.

1000621440 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 1000621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2245501440).

1000621440 is an abundant number, since it is smaller than the sum of its proper divisors (3490381440).

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

1000621440 is a wasteful number, since it uses less digits than its factorization.

1000621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1000621440 is about 31632.6009047628. The cubic root of 1000621440 is about 1000.2071037717.

Adding to 1000621440 its reverse (441260001), we get a palindrome (1441881441).

The spelling of 1000621440 in words is "one billion, six hundred twenty-one thousand, four hundred forty".