155403409 has 16 divisors (see below), whose sum is σ = 190003968. Its totient is φ = 124065792.

The previous prime is 155403383. The next prime is 155403421. The reversal of 155403409 is 904304551.

It is a cyclic number.

It is not a de Polignac number, because 155403409 - 2⁵ = 155403377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155403449) 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, 4812 + ... + 18274.

It is an arithmetic number, because the mean of its divisors is an integer number (11875248).

Almost surely, 2^155403409 is an apocalyptic number.

It is an amenable number.

155403409 is a deficient number, since it is larger than the sum of its proper divisors (34600559).

155403409 is a wasteful number, since it uses less digits than its factorization.

155403409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13584.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 155403409 is about 12466.0903654674. The cubic root of 155403409 is about 537.6341503268.

The spelling of 155403409 in words is "one hundred fifty-five million, four hundred three thousand, four hundred nine".