155531400 has 48 divisors (see below), whose sum is σ = 482149200. Its totient is φ = 41474880.

The previous prime is 155531381. The next prime is 155531407. The reversal of 155531400 is 4135551.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (155531407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129010 + ... + 130209.

It is an arithmetic number, because the mean of its divisors is an integer number (10044775).

Almost surely, 2^155531400 is an apocalyptic number.

155531400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155531400 is an abundant number, since it is smaller than the sum of its proper divisors (326617800).

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

155531400 is a wasteful number, since it uses less digits than its factorization.

155531400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259238 (or 259229 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 155531400 is about 12471.2228750833. Note that the first 3 decimals coincide. The cubic root of 155531400 is about 537.7817091871.

Adding to 155531400 its reverse (4135551), we get a palindrome (159666951).

The spelling of 155531400 in words is "one hundred fifty-five million, five hundred thirty-one thousand, four hundred".