154891998 has 24 divisors (see below), whose sum is σ = 355341168. Its totient is φ = 48593472.

The previous prime is 154891991. The next prime is 154892011. The reversal of 154891998 is 899198451.

154891998 is a `hidden beast` number, since 1 + 548 + 9 + 1 + 9 + 98 = 666.

154891998 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154891991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 252786 + ... + 253397.

It is an arithmetic number, because the mean of its divisors is an integer number (14805882).

Almost surely, 2^154891998 is an apocalyptic number.

154891998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

154891998 is an abundant number, since it is smaller than the sum of its proper divisors (200449170).

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

154891998 is a wasteful number, since it uses less digits than its factorization.

154891998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506208 (or 506205 counting only the distinct ones).

The product of its digits is 933120, while the sum is 54.

The square root of 154891998 is about 12445.5613774550. The cubic root of 154891998 is about 537.0437424705.

The spelling of 154891998 in words is "one hundred fifty-four million, eight hundred ninety-one thousand, nine hundred ninety-eight".