155231400 has 96 divisors (see below), whose sum is σ = 483406560. Its totient is φ = 41207040.

The previous prime is 155231327. The next prime is 155231407. The reversal of 155231400 is 4132551.

It is not an unprimeable number, because it can be changed into a prime (155231407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175359 + ... + 176241.

It is an arithmetic number, because the mean of its divisors is an integer number (5035485).

Almost surely, 2^155231400 is an apocalyptic number.

155231400 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 155231400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241703280).

155231400 is an abundant number, since it is smaller than the sum of its proper divisors (328175160).

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

155231400 is a wasteful number, since it uses less digits than its factorization.

155231400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 155231400 is about 12459.1893797309. The cubic root of 155231400 is about 537.4357161268.

Adding to 155231400 its reverse (4132551), we get a palindrome (159363951).

The spelling of 155231400 in words is "one hundred fifty-five million, two hundred thirty-one thousand, four hundred".