397778 has 8 divisors (see below), whose sum is σ = 606960. Its totient is φ = 195460.

The previous prime is 397763. The next prime is 397799. The reversal of 397778 is 877793.

It is a happy number.

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

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, 1568 + ... + 1803.

It is an arithmetic number, because the mean of its divisors is an integer number (75870).

2³⁹⁷⁷⁷⁸ is an apocalyptic number.

397778 is a deficient number, since it is larger than the sum of its proper divisors (209182).

397778 is a wasteful number, since it uses less digits than its factorization.

397778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432.

The product of its digits is 74088, while the sum is 41.

The square root of 397778 is about 630.6964404529. The cubic root of 397778 is about 73.5439445973.

The spelling of 397778 in words is "three hundred ninety-seven thousand, seven hundred seventy-eight".