398889611545 has 8 divisors (see below), whose sum is σ = 478965037320. Its totient is φ = 318913353600.

The previous prime is 398889611537. The next prime is 398889611551. The reversal of 398889611545 is 545116988893.

It can be written as a sum of positive squares in 4 ways, for example, as 168615354384 + 230274257161 = 410628^2 + 479869^2 .

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

It is not a de Polignac number, because 398889611545 - 2³ = 398889611537 is a prime.

It is a super-2 number, since 2×398889611545² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24783106 + ... + 24799195.

It is an arithmetic number, because the mean of its divisors is an integer number (59870629665).

Almost surely, 2^398889611545 is an apocalyptic number.

It is an amenable number.

398889611545 is a deficient number, since it is larger than the sum of its proper divisors (80075425775).

398889611545 is a wasteful number, since it uses less digits than its factorization.

398889611545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49583915.

The product of its digits is 74649600, while the sum is 67.

The spelling of 398889611545 in words is "three hundred ninety-eight billion, eight hundred eighty-nine million, six hundred eleven thousand, five hundred forty-five".