398666026 has 16 divisors (see below), whose sum is σ = 655244640. Its totient is φ = 180411280.

The previous prime is 398665991. The next prime is 398666063. The reversal of 398666026 is 620666893.

It is a happy 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, 34921 + ... + 44908.

It is an arithmetic number, because the mean of its divisors is an integer number (40952790).

Almost surely, 2^398666026 is an apocalyptic number.

398666026 is a deficient number, since it is larger than the sum of its proper divisors (256578614).

398666026 is a wasteful number, since it uses less digits than its factorization.

398666026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80069.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 398666026 is about 19966.6227990614. The cubic root of 398666026 is about 735.9863204865.

The spelling of 398666026 in words is "three hundred ninety-eight million, six hundred sixty-six thousand, twenty-six".