397491505 has 8 divisors (see below), whose sum is σ = 477964224. Its totient is φ = 317343600.

The previous prime is 397491491. The next prime is 397491511. The reversal of 397491505 is 505194793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397491505 - 2⁹ = 397490993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78501 + ... + 83410.

It is an arithmetic number, because the mean of its divisors is an integer number (59745528).

Almost surely, 2^397491505 is an apocalyptic number.

It is an amenable number.

397491505 is a deficient number, since it is larger than the sum of its proper divisors (80472719).

397491505 is a wasteful number, since it uses less digits than its factorization.

397491505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162407.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 397491505 is about 19937.1889944395. The cubic root of 397491505 is about 735.2628396502.

The spelling of 397491505 in words is "three hundred ninety-seven million, four hundred ninety-one thousand, five hundred five".