1097985726 has 64 divisors (see below), whose sum is σ = 2491536960. Its totient is φ = 358318080.

The previous prime is 1097985709. The next prime is 1097985727. The reversal of 1097985726 is 6275897901.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097985727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 845910 + ... + 847206.

It is an arithmetic number, because the mean of its divisors is an integer number (38930265).

Almost surely, 2^1097985726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1097985726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1245768480).

1097985726 is an abundant number, since it is smaller than the sum of its proper divisors (1393551234).

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

1097985726 is a wasteful number, since it uses less digits than its factorization.

1097985726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626 (or 1620 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The square root of 1097985726 is about 33135.8676663219. The cubic root of 1097985726 is about 1031.6496410737.

The spelling of 1097985726 in words is "one billion, ninety-seven million, nine hundred eighty-five thousand, seven hundred twenty-six".