155829421 has 8 divisors (see below), whose sum is σ = 171647424. Its totient is φ = 140286720.

The previous prime is 155829403. The next prime is 155829449. The reversal of 155829421 is 124928551.

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 155829421 - 2⁵ = 155829389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155829461) 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, 67636 + ... + 69901.

It is an arithmetic number, because the mean of its divisors is an integer number (21455928).

Almost surely, 2^155829421 is an apocalyptic number.

155829421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155829421 is a deficient number, since it is larger than the sum of its proper divisors (15818003).

155829421 is a wasteful number, since it uses less digits than its factorization.

155829421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137651.

The product of its digits is 28800, while the sum is 37.

The square root of 155829421 is about 12483.1655039898. The cubic root of 155829421 is about 538.1249796017.

The spelling of 155829421 in words is "one hundred fifty-five million, eight hundred twenty-nine thousand, four hundred twenty-one".