397459440 has 320 divisors, whose sum is σ = 1586565120. Its totient is φ = 89579520.

The previous prime is 397459429. The next prime is 397459441. The reversal of 397459440 is 44954793.

It is a happy number.

It is a super-2 number, since 2×397459440² = 315948012890227200, which contains 22 as substring.

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 (397459441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1466505 + ... + 1466775.

It is an arithmetic number, because the mean of its divisors is an integer number (4958016).

Almost surely, 2^397459440 is an apocalyptic number.

397459440 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 397459440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793282560).

397459440 is an abundant number, since it is smaller than the sum of its proper divisors (1189105680).

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

397459440 is a wasteful number, since it uses less digits than its factorization.

397459440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 397459440 is about 19936.3848277465. The cubic root of 397459440 is about 735.2430682952.

The spelling of 397459440 in words is "three hundred ninety-seven million, four hundred fifty-nine thousand, four hundred forty".