397990260 has 132 divisors (see below), whose sum is σ = 1257382308. Its totient is φ = 105815808.

The previous prime is 397990259. The next prime is 397990261. The reversal of 397990260 is 62099793.

It is an interprime number because it is at equal distance from previous prime (397990259) and next prime (397990261).

It can be written as a sum of positive squares in 2 ways, for example, as 124947684 + 273042576 = 11178^2 + 16524^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397990261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 1180812 + ... + 1181148.

Almost surely, 2^397990260 is an apocalyptic number.

397990260 is a gapful number since it is divisible by the number (30) 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 397990260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628691154).

397990260 is an abundant number, since it is smaller than the sum of its proper divisors (859392048).

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

397990260 is an equidigital number, since it uses as much as digits as its factorization.

397990260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 397990260 is about 19949.6932307241. The cubic root of 397990260 is about 735.5702363619.

The spelling of 397990260 in words is "three hundred ninety-seven million, nine hundred ninety thousand, two hundred sixty".