398665722 has 32 divisors (see below), whose sum is σ = 981332352. Its totient is φ = 105142464.

The previous prime is 398665711. The next prime is 398665727. The reversal of 398665722 is 227566893.

It is a super-3 number, since 3×398665722³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (398665727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364533 + ... + 365624.

It is an arithmetic number, because the mean of its divisors is an integer number (30666636).

Almost surely, 2^398665722 is an apocalyptic number.

398665722 is an abundant number, since it is smaller than the sum of its proper divisors (582666630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398665722 is a wasteful number, since it uses less digits than its factorization.

398665722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730182.

The product of its digits is 1088640, while the sum is 48.

The square root of 398665722 is about 19966.6151863554. The cubic root of 398665722 is about 735.9861334127.

The spelling of 398665722 in words is "three hundred ninety-eight million, six hundred sixty-five thousand, seven hundred twenty-two".