155840000 has 100 divisors (see below), whose sum is σ = 389893944. Its totient is φ = 62208000.

The previous prime is 155839993. The next prime is 155840023. The reversal of 155840000 is 48551.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×155840000² = 48572211200000000, which contains 22 as substring.

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 9 ways as a sum of consecutive naturals, for example, 319757 + ... + 320243.

Almost surely, 2^155840000 is an apocalyptic number.

155840000 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 155840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194946972).

155840000 is an abundant number, since it is smaller than the sum of its proper divisors (234053944).

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

155840000 is an frugal number, since it uses more digits than its factorization.

155840000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 155840000 is about 12483.5892274618. The cubic root of 155840000 is about 538.1371567959.

Adding to 155840000 its reverse (48551), we get a palindrome (155888551).

The spelling of 155840000 in words is "one hundred fifty-five million, eight hundred forty thousand".