1097621440 has 56 divisors (see below), whose sum is σ = 2674528560. Its totient is φ = 428832768.

The previous prime is 1097621429. The next prime is 1097621449. The reversal of 1097621440 is 441267901.

It is a junction number, because it is equal to n+sod(n) for n = 1097621396 and 1097621405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097621449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26125 + ... + 53644.

Almost surely, 2^1097621440 is an apocalyptic number.

1097621440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097621440 is an abundant number, since it is smaller than the sum of its proper divisors (1576907120).

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

1097621440 is an equidigital number, since it uses as much as digits as its factorization.

1097621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79829 (or 79819 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1097621440 is about 33130.3703571210. The cubic root of 1097621440 is about 1031.5355360412.

The spelling of 1097621440 in words is "one billion, ninety-seven million, six hundred twenty-one thousand, four hundred forty".