397533409 has 32 divisors (see below), whose sum is σ = 527098880. Its totient is φ = 290993472.

The previous prime is 397533391. The next prime is 397533419. The reversal of 397533409 is 904335793.

It is not a de Polignac number, because 397533409 - 2¹¹ = 397531361 is a prime.

It is a super-2 number, since 2×397533409² = 316065622542322562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (397533419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71674 + ... + 77020.

It is an arithmetic number, because the mean of its divisors is an integer number (16471840).

Almost surely, 2^397533409 is an apocalyptic number.

It is an amenable number.

397533409 is a deficient number, since it is larger than the sum of its proper divisors (129565471).

397533409 is a wasteful number, since it uses less digits than its factorization.

397533409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5429.

The product of its (nonzero) digits is 306180, while the sum is 43.

The square root of 397533409 is about 19938.2398671498. The cubic root of 397533409 is about 735.2886761532.

The spelling of 397533409 in words is "three hundred ninety-seven million, five hundred thirty-three thousand, four hundred nine".