155203830 has 64 divisors (see below), whose sum is σ = 414996480. Its totient is φ = 41275872.

The previous prime is 155203817. The next prime is 155203831. The reversal of 155203830 is 38302551.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 155203794 and 155203803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155203831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163417 + ... + 164363.

It is an arithmetic number, because the mean of its divisors is an integer number (6484320).

Almost surely, 2^155203830 is an apocalyptic number.

155203830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155203830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207498240).

155203830 is an abundant number, since it is smaller than the sum of its proper divisors (259792650).

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

155203830 is a wasteful number, since it uses less digits than its factorization.

155203830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570 (or 1564 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 155203830 is about 12458.0829183306. The cubic root of 155203830 is about 537.4038970060.

The spelling of 155203830 in words is "one hundred fifty-five million, two hundred three thousand, eight hundred thirty".