155731380 has 96 divisors (see below), whose sum is σ = 509988864. Its totient is φ = 34763904.

The previous prime is 155731379. The next prime is 155731403. The reversal of 155731380 is 83137551.

It is a congruent number.

It is an unprimeable 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 31 ways as a sum of consecutive naturals, for example, 13749 + ... + 22371.

It is an arithmetic number, because the mean of its divisors is an integer number (5312384).

Almost surely, 2^155731380 is an apocalyptic number.

155731380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155731380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254994432).

155731380 is an abundant number, since it is smaller than the sum of its proper divisors (354257484).

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

155731380 is a wasteful number, since it uses less digits than its factorization.

155731380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8685 (or 8683 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 155731380 is about 12479.2379575037. The cubic root of 155731380 is about 538.0121010900.

The spelling of 155731380 in words is "one hundred fifty-five million, seven hundred thirty-one thousand, three hundred eighty".