155215420 has 24 divisors (see below), whose sum is σ = 326446848. Its totient is φ = 61992000.

The previous prime is 155215409. The next prime is 155215433. The reversal of 155215420 is 24512551.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8485 + ... + 19555.

It is an arithmetic number, because the mean of its divisors is an integer number (13601952).

Almost surely, 2^155215420 is an apocalyptic number.

155215420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155215420 is an abundant number, since it is smaller than the sum of its proper divisors (171231428).

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

155215420 is a wasteful number, since it uses less digits than its factorization.

155215420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11781 (or 11779 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 155215420 is about 12458.5480694983. The cubic root of 155215420 is about 537.4172737295.

Adding to 155215420 its reverse (24512551), we get a palindrome (179727971).

The spelling of 155215420 in words is "one hundred fifty-five million, two hundred fifteen thousand, four hundred twenty".