155420425 has 12 divisors (see below), whose sum is σ = 199367820. Its totient is φ = 120048320.

The previous prime is 155420383. The next prime is 155420459. The reversal of 155420425 is 524024551.

It can be written as a sum of positive squares in 6 ways, for example, as 10169721 + 145250704 = 3189^2 + 12052^2 .

It is not a de Polignac number, because 155420425 - 2⁷ = 155420297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155420393 and 155420402.

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 11 ways as a sum of consecutive naturals, for example, 106462 + ... + 107911.

It is an arithmetic number, because the mean of its divisors is an integer number (16613985).

Almost surely, 2^155420425 is an apocalyptic number.

It is an amenable number.

155420425 is a deficient number, since it is larger than the sum of its proper divisors (43947395).

155420425 is a wasteful number, since it uses less digits than its factorization.

155420425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214412 (or 214407 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 155420425 is about 12466.7728382288. The cubic root of 155420425 is about 537.6537724807.

Adding to 155420425 its reverse (524024551), we get a palindrome (679444976).

The spelling of 155420425 in words is "one hundred fifty-five million, four hundred twenty thousand, four hundred twenty-five".