398305887 has 16 divisors (see below), whose sum is σ = 626522112. Its totient is φ = 220260960.

The previous prime is 398305849. The next prime is 398305889. The reversal of 398305887 is 788503893.

It is a happy number.

It is not a de Polignac number, because 398305887 - 2⁶ = 398305823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398305889) 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, 305268 + ... + 306569.

It is an arithmetic number, because the mean of its divisors is an integer number (39157632).

Almost surely, 2^398305887 is an apocalyptic number.

398305887 is a deficient number, since it is larger than the sum of its proper divisors (228216225).

398305887 is a wasteful number, since it uses less digits than its factorization.

398305887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611878.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 398305887 is about 19957.6022357396. The cubic root of 398305887 is about 735.7646334817.

The spelling of 398305887 in words is "three hundred ninety-eight million, three hundred five thousand, eight hundred eighty-seven".