398545887 has 16 divisors (see below), whose sum is σ = 544439808. Its totient is φ = 259190400.

The previous prime is 398545867. The next prime is 398545963. The reversal of 398545887 is 788545893.

It is a happy number.

It is not a de Polignac number, because 398545887 - 2¹² = 398541791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398545867) 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, 140887 + ... + 143687.

It is an arithmetic number, because the mean of its divisors is an integer number (34027488).

Almost surely, 2^398545887 is an apocalyptic number.

398545887 is a deficient number, since it is larger than the sum of its proper divisors (145893921).

398545887 is a wasteful number, since it uses less digits than its factorization.

398545887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3950.

The product of its digits is 9676800, while the sum is 57.

The square root of 398545887 is about 19963.6140766145. The cubic root of 398545887 is about 735.9123826219.

The spelling of 398545887 in words is "three hundred ninety-eight million, five hundred forty-five thousand, eight hundred eighty-seven".