398132409 has 8 divisors (see below), whose sum is σ = 531112960. Its totient is φ = 265286736.

The previous prime is 398132407. The next prime is 398132417. The reversal of 398132409 is 904231893.

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

It is not a de Polignac number, because 398132409 - 2¹ = 398132407 is a prime.

It is a super-2 number, since 2×398132409² = 317018830192286562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398132407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26617 + ... + 38790.

It is an arithmetic number, because the mean of its divisors is an integer number (66389120).

Almost surely, 2^398132409 is an apocalyptic number.

It is an amenable number.

398132409 is a deficient number, since it is larger than the sum of its proper divisors (132980551).

398132409 is a wasteful number, since it uses less digits than its factorization.

398132409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67439.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 398132409 is about 19953.2555990244. The cubic root of 398132409 is about 735.6577997506.

The spelling of 398132409 in words is "three hundred ninety-eight million, one hundred thirty-two thousand, four hundred nine".