397961545 has 4 divisors (see below), whose sum is σ = 477553860. Its totient is φ = 318369232.

The previous prime is 397961537. The next prime is 397961579. The reversal of 397961545 is 545169793.

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

It can be written as a sum of positive squares in 2 ways, for example, as 69155856 + 328805689 = 8316^2 + 18133^2 .

It is a cyclic number.

It is not a de Polignac number, because 397961545 - 2³ = 397961537 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39796150 + ... + 39796159.

It is an arithmetic number, because the mean of its divisors is an integer number (119388465).

Almost surely, 2^397961545 is an apocalyptic number.

It is an amenable number.

397961545 is a deficient number, since it is larger than the sum of its proper divisors (79592315).

397961545 is an equidigital number, since it uses as much as digits as its factorization.

397961545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79592314.

The product of its digits is 1020600, while the sum is 49.

The square root of 397961545 is about 19948.9735324903. The cubic root of 397961545 is about 735.5525454705.

The spelling of 397961545 in words is "three hundred ninety-seven million, nine hundred sixty-one thousand, five hundred forty-five".