397405770 has 64 divisors (see below), whose sum is σ = 1012248576. Its totient is φ = 99507200.

The previous prime is 397405741. The next prime is 397405777. The reversal of 397405770 is 77504793.

It is not an unprimeable number, because it can be changed into a prime (397405777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 344695 + ... + 345845.

It is an arithmetic number, because the mean of its divisors is an integer number (15816384).

Almost surely, 2^397405770 is an apocalyptic number.

397405770 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 397405770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (506124288).

397405770 is an abundant number, since it is smaller than the sum of its proper divisors (614842806).

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

397405770 is a wasteful number, since it uses less digits than its factorization.

397405770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855.

The product of its (nonzero) digits is 185220, while the sum is 42.

The square root of 397405770 is about 19935.0387509029. The cubic root of 397405770 is about 735.2099728665.

The spelling of 397405770 in words is "three hundred ninety-seven million, four hundred five thousand, seven hundred seventy".