154990 has 16 divisors (see below), whose sum is σ = 304560. Its totient is φ = 56320.

The previous prime is 154981. The next prime is 154991. The reversal of 154990 is 99451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154991) by changing a digit.

154990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 595 + ... + 814.

It is an arithmetic number, because the mean of its divisors is an integer number (19035).

2¹⁵⁴⁹⁹⁰ is an apocalyptic number.

154990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

154990 is a deficient number, since it is larger than the sum of its proper divisors (149570).

154990 is a wasteful number, since it uses less digits than its factorization.

154990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 154990 is about 393.6876934830. The cubic root of 154990 is about 53.7156983235.

It can be divided in two parts, 15 and 4990, that added together give a palindrome (5005).

The spelling of 154990 in words is "one hundred fifty-four thousand, nine hundred ninety".