155424421 has 8 divisors (see below), whose sum is σ = 169876224. Its totient is φ = 141562560.

The previous prime is 155424407. The next prime is 155424439. The reversal of 155424421 is 124424551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155424421 - 2¹³ = 155416229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155424421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155424221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146935 + ... + 147988.

It is an arithmetic number, because the mean of its divisors is an integer number (21234528).

Almost surely, 2^155424421 is an apocalyptic number.

It is an amenable number.

155424421 is a deficient number, since it is larger than the sum of its proper divisors (14451803).

155424421 is a wasteful number, since it uses less digits than its factorization.

155424421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294971.

The product of its digits is 6400, while the sum is 28.

The square root of 155424421 is about 12466.9331032135. The cubic root of 155424421 is about 537.6583802965.

Adding to 155424421 its reverse (124424551), we get a palindrome (279848972).

The spelling of 155424421 in words is "one hundred fifty-five million, four hundred twenty-four thousand, four hundred twenty-one".