397915 has 8 divisors (see below), whose sum is σ = 545760. Its totient is φ = 272832.

The previous prime is 397907. The next prime is 397921. The reversal of 397915 is 519793.

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

It is not a de Polignac number, because 397915 - 2³ = 397907 is a prime.

397915 is a lucky 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, 5650 + ... + 5719.

It is an arithmetic number, because the mean of its divisors is an integer number (68220).

2³⁹⁷⁹¹⁵ is an apocalyptic number.

397915 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

397915 is a deficient number, since it is larger than the sum of its proper divisors (147845).

397915 is a wasteful number, since it uses less digits than its factorization.

397915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11381.

The product of its digits is 8505, while the sum is 34.

The square root of 397915 is about 630.8050411974. The cubic root of 397915 is about 73.5523867969.

It can be divided in two parts, 3979 and 15, that multiplied together give a triangular number (59685 = T₃₄₅).

The spelling of 397915 in words is "three hundred ninety-seven thousand, nine hundred fifteen".