155132440 has 32 divisors (see below), whose sum is σ = 350820000. Its totient is φ = 61737984.

The previous prime is 155132437. The next prime is 155132441. The reversal of 155132440 is 44231551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155132441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1785 + ... + 17704.

It is an arithmetic number, because the mean of its divisors is an integer number (10963125).

Almost surely, 2^155132440 is an apocalyptic number.

155132440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155132440 is an abundant number, since it is smaller than the sum of its proper divisors (195687560).

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

155132440 is a wasteful number, since it uses less digits than its factorization.

155132440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19699 (or 19695 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 155132440 is about 12455.2173806803. The cubic root of 155132440 is about 537.3214867801.

Adding to 155132440 its reverse (44231551), we get a palindrome (199363991).

The spelling of 155132440 in words is "one hundred fifty-five million, one hundred thirty-two thousand, four hundred forty".