155321400 has 96 divisors (see below), whose sum is σ = 518560560. Its totient is φ = 38231040.

The previous prime is 155321399. The next prime is 155321473. The reversal of 155321400 is 4123551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2157 + ... + 17756.

Almost surely, 2^155321400 is an apocalyptic number.

155321400 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 155321400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259280280).

155321400 is an abundant number, since it is smaller than the sum of its proper divisors (363239160).

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

155321400 is a wasteful number, since it uses less digits than its factorization.

155321400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19945 (or 19936 counting only the distinct ones).

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

The square root of 155321400 is about 12462.8006483294. The cubic root of 155321400 is about 537.5395608163.

Adding to 155321400 its reverse (4123551), we get a palindrome (159444951).

The spelling of 155321400 in words is "one hundred fifty-five million, three hundred twenty-one thousand, four hundred".