172990 has 8 divisors (see below), whose sum is σ = 311400. Its totient is φ = 69192.

The previous prime is 172987. The next prime is 172993. The reversal of 172990 is 99271.

172990 = 184² + 185² + ... + 188².

It is an interprime number because it is at equal distance from previous prime (172987) and next prime (172993).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172993) 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 3 ways as a sum of consecutive naturals, for example, 8640 + ... + 8659.

It is an arithmetic number, because the mean of its divisors is an integer number (38925).

2¹⁷²⁹⁹⁰ is an apocalyptic number.

172990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172990 is a deficient number, since it is larger than the sum of its proper divisors (138410).

172990 is a wasteful number, since it uses less digits than its factorization.

172990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17306.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 172990 is about 415.9206655121. The cubic root of 172990 is about 55.7194729211.

The spelling of 172990 in words is "one hundred seventy-two thousand, nine hundred ninety".