155857380 has 96 divisors (see below), whose sum is σ = 525020160. Its totient is φ = 33747840.

The previous prime is 155857349. The next prime is 155857417. The reversal of 155857380 is 83758551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1786 + ... + 17745.

It is an arithmetic number, because the mean of its divisors is an integer number (5468960).

Almost surely, 2^155857380 is an apocalyptic number.

155857380 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 155857380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262510080).

155857380 is an abundant number, since it is smaller than the sum of its proper divisors (369162780).

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

155857380 is a wasteful number, since it uses less digits than its factorization.

155857380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19569 (or 19567 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 42.

The square root of 155857380 is about 12484.2853219558. The cubic root of 155857380 is about 538.1571612366.

The spelling of 155857380 in words is "one hundred fifty-five million, eight hundred fifty-seven thousand, three hundred eighty".