154640 has 20 divisors (see below), whose sum is σ = 359724. Its totient is φ = 61824.

The previous prime is 154621. The next prime is 154643. The reversal of 154640 is 46451.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 80656 + 73984 = 284^2 + 272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (154643) by changing a digit.

154640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887 + ... + 1046.

2¹⁵⁴⁶⁴⁰ is an apocalyptic number.

154640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

154640 is an abundant number, since it is smaller than the sum of its proper divisors (205084).

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

154640 is a wasteful number, since it uses less digits than its factorization.

154640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946 (or 1940 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 154640 is about 393.2429274634. The cubic root of 154640 is about 53.6752340698.

The spelling of 154640 in words is "one hundred fifty-four thousand, six hundred forty".