397720135 has 4 divisors (see below), whose sum is σ = 477264168. Its totient is φ = 318176104.

The previous prime is 397720129. The next prime is 397720153. The reversal of 397720135 is 531027793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397720135 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397720094 and 397720103.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 39772009 + ... + 39772018.

It is an arithmetic number, because the mean of its divisors is an integer number (119316042).

Almost surely, 2^397720135 is an apocalyptic number.

397720135 is a deficient number, since it is larger than the sum of its proper divisors (79544033).

397720135 is an equidigital number, since it uses as much as digits as its factorization.

397720135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79544032.

The product of its (nonzero) digits is 39690, while the sum is 37.

The square root of 397720135 is about 19942.9219273405. The cubic root of 397720135 is about 735.4037826400.

The spelling of 397720135 in words is "three hundred ninety-seven million, seven hundred twenty thousand, one hundred thirty-five".