155885421 has 16 divisors (see below), whose sum is σ = 218814336. Its totient is φ = 98520576.

The previous prime is 155885419. The next prime is 155885423. The reversal of 155885421 is 124588551.

It is an interprime number because it is at equal distance from previous prime (155885419) and next prime (155885423).

It is not a de Polignac number, because 155885421 - 2¹ = 155885419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155885421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155885423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2200 + ... + 17793.

It is an arithmetic number, because the mean of its divisors is an integer number (13675896).

Almost surely, 2^155885421 is an apocalyptic number.

It is an amenable number.

155885421 is a deficient number, since it is larger than the sum of its proper divisors (62928915).

155885421 is a wasteful number, since it uses less digits than its factorization.

155885421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20132.

The product of its digits is 64000, while the sum is 39.

The square root of 155885421 is about 12485.4083233189. The cubic root of 155885421 is about 538.1894333905.

The spelling of 155885421 in words is "one hundred fifty-five million, eight hundred eighty-five thousand, four hundred twenty-one".