155407 has 6 divisors (see below), whose sum is σ = 178808. Its totient is φ = 132312.

The previous prime is 155399. The next prime is 155413. The reversal of 155407 is 704551.

It is not a de Polignac number, because 155407 - 2³ = 155399 is a prime.

155407 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155707) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 969 + ... + 1117.

2¹⁵⁵⁴⁰⁷ is an apocalyptic number.

155407 is a deficient number, since it is larger than the sum of its proper divisors (23401).

155407 is an frugal number, since it uses more digits than its factorization.

155407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 155407 is about 394.2169453486. The cubic root of 155407 is about 53.7638291440.

Multiplying 155407 by its product of nonzero digits (700), we get a square (108784900 = 10430²).

Adding to 155407 its reverse (704551), we get a palindrome (859958).

The spelling of 155407 in words is "one hundred fifty-five thousand, four hundred seven".