397801894 has 12 divisors (see below), whose sum is σ = 694123884. Its totient is φ = 170486484.

The previous prime is 397801891. The next prime is 397801907. The reversal of 397801894 is 498108793.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397801891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2029504 + ... + 2029699.

It is an arithmetic number, because the mean of its divisors is an integer number (57843657).

Almost surely, 2^397801894 is an apocalyptic number.

397801894 is a deficient number, since it is larger than the sum of its proper divisors (296321990).

397801894 is a wasteful number, since it uses less digits than its factorization.

397801894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4059219 (or 4059212 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 397801894 is about 19944.9716470092. The cubic root of 397801894 is about 735.4541713036.

The spelling of 397801894 in words is "three hundred ninety-seven million, eight hundred one thousand, eight hundred ninety-four".