1554985998 has 40 divisors (see below), whose sum is σ = 3496822560. Its totient is φ = 516468960.

The previous prime is 1554985997. The next prime is 1554986029. The reversal of 1554985998 is 8995894551.

1554985998 is a `hidden beast` number, since 1 + 5 + 5 + 498 + 59 + 98 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1554985997) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28443 + ... + 62601.

It is an arithmetic number, because the mean of its divisors is an integer number (87420564).

Almost surely, 2^1554985998 is an apocalyptic number.

1554985998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1554985998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1748411280).

1554985998 is an abundant number, since it is smaller than the sum of its proper divisors (1941836562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1554985998 is a wasteful number, since it uses less digits than its factorization.

1554985998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34454 (or 34445 counting only the distinct ones).

The product of its digits is 23328000, while the sum is 63.

The square root of 1554985998 is about 39433.3107664066. The cubic root of 1554985998 is about 1158.5341169442.

The spelling of 1554985998 in words is "one billion, five hundred fifty-four million, nine hundred eighty-five thousand, nine hundred ninety-eight".