1397822080 has 64 divisors (see below), whose sum is σ = 3352101480. Its totient is φ = 557383680.

The previous prime is 1397822051. The next prime is 1397822081. The reversal of 1397822080 is 802287931.

It can be written as a sum of positive squares in 4 ways, for example, as 1273633344 + 124188736 = 35688^2 + 11144^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1397822081) 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, 212440 + ... + 218920.

Almost surely, 2^1397822080 is an apocalyptic number.

1397822080 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 1397822080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1676050740).

1397822080 is an abundant number, since it is smaller than the sum of its proper divisors (1954279400).

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

1397822080 is an equidigital number, since it uses as much as digits as its factorization.

1397822080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837 (or 6825 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1397822080 is about 37387.4588598904. The cubic root of 1397822080 is about 1118.1085421951.

The spelling of 1397822080 in words is "one billion, three hundred ninety-seven million, eight hundred twenty-two thousand, eighty".