397834078 has 4 divisors (see below), whose sum is σ = 596751120. Its totient is φ = 198917038.

The previous prime is 397834069. The next prime is 397834081. The reversal of 397834078 is 870438793.

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

It is a super-2 number, since 2×397834078² = 316543907236220168, which contains 22 as substring.

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99458518 + ... + 99458521.

It is an arithmetic number, because the mean of its divisors is an integer number (149187780).

Almost surely, 2^397834078 is an apocalyptic number.

397834078 is a deficient number, since it is larger than the sum of its proper divisors (198917042).

397834078 is a wasteful number, since it uses less digits than its factorization.

397834078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198917041.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 397834078 is about 19945.7784505895. The cubic root of 397834078 is about 735.4740046420.

The spelling of 397834078 in words is "three hundred ninety-seven million, eight hundred thirty-four thousand, seventy-eight".