397749660 has 240 divisors, whose sum is σ = 1422997632. Its totient is φ = 82320000.

The previous prime is 397749659. The next prime is 397749661. The reversal of 397749660 is 66947793.

It is an interprime number because it is at equal distance from previous prime (397749659) and next prime (397749661).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397749661) 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 79 ways as a sum of consecutive naturals, for example, 1584535 + ... + 1584785.

Almost surely, 2^397749660 is an apocalyptic number.

397749660 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 397749660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (711498816).

397749660 is an abundant number, since it is smaller than the sum of its proper divisors (1025247972).

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

397749660 is a wasteful number, since it uses less digits than its factorization.

397749660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 51.

The square root of 397749660 is about 19943.6621511697. The cubic root of 397749660 is about 735.4219799078.

It can be divided in two parts, 397 and 749660, that added together give a palindrome (750057).

The spelling of 397749660 in words is "three hundred ninety-seven million, seven hundred forty-nine thousand, six hundred sixty".