398217723 has 8 divisors (see below), whose sum is σ = 548084736. Its totient is φ = 256914600.

The previous prime is 398217697. The next prime is 398217733. The reversal of 398217723 is 327712893.

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

It is not a de Polignac number, because 398217723 - 2¹³ = 398209531 is a prime.

It is a super-2 number, since 2×398217723² = 317154709822609458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (398217733) 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 7 ways as a sum of consecutive naturals, for example, 2140863 + ... + 2141048.

It is an arithmetic number, because the mean of its divisors is an integer number (68510592).

Almost surely, 2^398217723 is an apocalyptic number.

398217723 is a deficient number, since it is larger than the sum of its proper divisors (149867013).

398217723 is a wasteful number, since it uses less digits than its factorization.

398217723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4281945.

The product of its digits is 127008, while the sum is 42.

The square root of 398217723 is about 19955.3933311273. The cubic root of 398217723 is about 735.7103429294.

The spelling of 398217723 in words is "three hundred ninety-eight million, two hundred seventeen thousand, seven hundred twenty-three".