155531420 has 24 divisors (see below), whose sum is σ = 356308848. Its totient is φ = 56556800.

The previous prime is 155531407. The next prime is 155531443. The reversal of 155531420 is 24135551.

It is a self number, because there is not a number n which added to its sum of digits gives 155531420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353261 + ... + 353700.

It is an arithmetic number, because the mean of its divisors is an integer number (14846202).

Almost surely, 2^155531420 is an apocalyptic number.

155531420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155531420 is an abundant number, since it is smaller than the sum of its proper divisors (200777428).

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

155531420 is a wasteful number, since it uses less digits than its factorization.

155531420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706981 (or 706979 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 155531420 is about 12471.2236769292. The cubic root of 155531420 is about 537.7817322385.

Adding to 155531420 its reverse (24135551), we get a palindrome (179666971).

The spelling of 155531420 in words is "one hundred fifty-five million, five hundred thirty-one thousand, four hundred twenty".