398986556 has 12 divisors (see below), whose sum is σ = 710061240. Its totient is φ = 196111920.

The previous prime is 398986513. The next prime is 398986571. The reversal of 398986556 is 655689893.

It is a super-2 number, since 2×398986556² = 318380543737482272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a junction number, because it is equal to n+sod(n) for n = 398986495 and 398986504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 845075 + ... + 845546.

It is an arithmetic number, because the mean of its divisors is an integer number (59171770).

Almost surely, 2^398986556 is an apocalyptic number.

It is an amenable number.

398986556 is a deficient number, since it is larger than the sum of its proper divisors (311074684).

398986556 is a wasteful number, since it uses less digits than its factorization.

398986556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690684 (or 1690682 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 59.

The square root of 398986556 is about 19974.6478316890. The cubic root of 398986556 is about 736.1835135294.

The spelling of 398986556 in words is "three hundred ninety-eight million, nine hundred eighty-six thousand, five hundred fifty-six".