398644870 has 16 divisors (see below), whose sum is σ = 772758000. Its totient is φ = 147191904.

The previous prime is 398644861. The next prime is 398644889. The reversal of 398644870 is 78446893.

It is a congruent 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, 1533120 + ... + 1533379.

It is an arithmetic number, because the mean of its divisors is an integer number (48297375).

Almost surely, 2^398644870 is an apocalyptic number.

398644870 is a deficient number, since it is larger than the sum of its proper divisors (374113130).

398644870 is a wasteful number, since it uses less digits than its factorization.

398644870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066519.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 398644870 is about 19966.0930078972. The cubic root of 398644870 is about 735.9733014004.

The spelling of 398644870 in words is "three hundred ninety-eight million, six hundred forty-four thousand, eight hundred seventy".