155431420 has 12 divisors (see below), whose sum is σ = 326406024. Its totient is φ = 62172560.

The previous prime is 155431417. The next prime is 155431439. The reversal of 155431420 is 24134551.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3885766 + ... + 3885805.

It is an arithmetic number, because the mean of its divisors is an integer number (27200502).

Almost surely, 2^155431420 is an apocalyptic number.

155431420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155431420 is an abundant number, since it is smaller than the sum of its proper divisors (170974604).

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

155431420 is a wasteful number, since it uses less digits than its factorization.

155431420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7771580 (or 7771578 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 155431420 is about 12467.2138026104. The cubic root of 155431420 is about 537.6664507024. Note that the first 3 decimals are identical.

Adding to 155431420 its reverse (24134551), we get a palindrome (179565971).

The spelling of 155431420 in words is "one hundred fifty-five million, four hundred thirty-one thousand, four hundred twenty".