397837847 has 4 divisors (see below), whose sum is σ = 434004936. Its totient is φ = 361670760.

The previous prime is 397837823. The next prime is 397837871. The reversal of 397837847 is 748738793.

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

It is an interprime number because it is at equal distance from previous prime (397837823) and next prime (397837871).

It is a de Polignac number, because none of the positive numbers 2^k-397837847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397837792 and 397837801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397836847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18083528 + ... + 18083549.

It is an arithmetic number, because the mean of its divisors is an integer number (108501234).

Almost surely, 2^397837847 is an apocalyptic number.

397837847 is a deficient number, since it is larger than the sum of its proper divisors (36167089).

397837847 is a wasteful number, since it uses less digits than its factorization.

397837847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36167088.

The product of its digits is 7112448, while the sum is 56.

The square root of 397837847 is about 19945.8729315114. The cubic root of 397837847 is about 735.4763272123.

The spelling of 397837847 in words is "three hundred ninety-seven million, eight hundred thirty-seven thousand, eight hundred forty-seven".