398705652 has 72 divisors (see below), whose sum is σ = 1100226400. Its totient is φ = 125901216.

The previous prime is 398705623. The next prime is 398705669. The reversal of 398705652 is 256507893.

It is a happy number.

398705652 is a `hidden beast` number, since 3 + 9 + 87 + 0 + 565 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 398705598 and 398705607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7674 + ... + 29262.

Almost surely, 2^398705652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398705652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (550113200).

398705652 is an abundant number, since it is smaller than the sum of its proper divisors (701520748).

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

398705652 is a wasteful number, since it uses less digits than its factorization.

398705652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21627 (or 21613 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 398705652 is about 19967.6150804246. The cubic root of 398705652 is about 736.0107044954.

The spelling of 398705652 in words is "three hundred ninety-eight million, seven hundred five thousand, six hundred fifty-two".