171405993 has 16 divisors (see below), whose sum is σ = 250257600. Its totient is φ = 103490880.

The previous prime is 171405977. The next prime is 171406009. The reversal of 171405993 is 399504171.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (171405977) and next prime (171406009).

It is not a de Polignac number, because 171405993 - 2⁴ = 171405977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171405943) 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, 778 + ... + 18531.

It is an arithmetic number, because the mean of its divisors is an integer number (15641100).

Almost surely, 2^171405993 is an apocalyptic number.

It is an amenable number.

171405993 is a deficient number, since it is larger than the sum of its proper divisors (78851607).

171405993 is a wasteful number, since it uses less digits than its factorization.

171405993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19592.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 171405993 is about 13092.2111577839. The cubic root of 171405993 is about 555.4888347977.

The spelling of 171405993 in words is "one hundred seventy-one million, four hundred five thousand, nine hundred ninety-three".