398005406 has 8 divisors (see below), whose sum is σ = 599228280. Its totient is φ = 198262648.

The previous prime is 398005381. The next prime is 398005423. The reversal of 398005406 is 604500893.

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

It is a congruent number.

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, 369356 + ... + 370431.

It is an arithmetic number, because the mean of its divisors is an integer number (74903535).

Almost surely, 2^398005406 is an apocalyptic number.

398005406 is a deficient number, since it is larger than the sum of its proper divisors (201222874).

398005406 is a wasteful number, since it uses less digits than its factorization.

398005406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740058.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 398005406 is about 19950.0728319473. The cubic root of 398005406 is about 735.5795672481.

The spelling of 398005406 in words is "three hundred ninety-eight million, five thousand, four hundred six".