398739747 has 8 divisors (see below), whose sum is σ = 607603456. Its totient is φ = 227851272.

The previous prime is 398739727. The next prime is 398739769. The reversal of 398739747 is 747937893.

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

It is not a de Polignac number, because 398739747 - 2¹² = 398735651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398739727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9493783 + ... + 9493824.

It is an arithmetic number, because the mean of its divisors is an integer number (75950432).

Almost surely, 2^398739747 is an apocalyptic number.

398739747 is a deficient number, since it is larger than the sum of its proper divisors (208863709).

398739747 is a wasteful number, since it uses less digits than its factorization.

398739747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18987617.

The product of its digits is 8001504, while the sum is 57.

The square root of 398739747 is about 19968.4688196166. The cubic root of 398739747 is about 736.0316836894.

It can be divided in two parts, 3987 and 39747, that added together give a palindrome (43734).

The spelling of 398739747 in words is "three hundred ninety-eight million, seven hundred thirty-nine thousand, seven hundred forty-seven".