398806747 has 4 divisors (see below), whose sum is σ = 399811696. Its totient is φ = 397801800.

The previous prime is 398806711. The next prime is 398806769. The reversal of 398806747 is 747608893.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398806747 - 2⁷ = 398806619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398806694 and 398806703.

It is not an unprimeable number, because it can be changed into a prime (398866747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501879 + ... + 502672.

It is an arithmetic number, because the mean of its divisors is an integer number (99952924).

Almost surely, 2^398806747 is an apocalyptic number.

398806747 is a deficient number, since it is larger than the sum of its proper divisors (1004949).

398806747 is a wasteful number, since it uses less digits than its factorization.

398806747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004948.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 398806747 is about 19970.1463940553. The cubic root of 398806747 is about 736.0729063677.

The spelling of 398806747 in words is "three hundred ninety-eight million, eight hundred six thousand, seven hundred forty-seven".