1097388972 has 144 divisors (see below), whose sum is σ = 3029225472. Its totient is φ = 346705920.

The previous prime is 1097388953. The next prime is 1097388977. The reversal of 1097388972 is 2798837901.

It is a super-3 number, since 3×1097388972³ (a number of 28 digits) contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1097388977) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4269868 + ... + 4270124.

It is an arithmetic number, because the mean of its divisors is an integer number (21036288).

Almost surely, 2^1097388972 is an apocalyptic number.

1097388972 is a gapful number since it is divisible by the number (12) 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 1097388972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1514612736).

1097388972 is an abundant number, since it is smaller than the sum of its proper divisors (1931836500).

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

1097388972 is a wasteful number, since it uses less digits than its factorization.

1097388972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 1097388972 is about 33126.8617891885. The cubic root of 1097388972 is about 1031.4627070659.

The spelling of 1097388972 in words is "one billion, ninety-seven million, three hundred eighty-eight thousand, nine hundred seventy-two".