172238490 has 48 divisors (see below), whose sum is σ = 467296128. Its totient is φ = 43932768.

The previous prime is 172238483. The next prime is 172238491. The reversal of 172238490 is 94832271.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172238491) 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 23 ways as a sum of consecutive naturals, for example, 39534 + ... + 43673.

It is an arithmetic number, because the mean of its divisors is an integer number (9735336).

Almost surely, 2^172238490 is an apocalyptic number.

172238490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172238490 is an abundant number, since it is smaller than the sum of its proper divisors (295057638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172238490 is a wasteful number, since it uses less digits than its factorization.

172238490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83243 (or 83240 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 172238490 is about 13123.9662450038. The cubic root of 172238490 is about 556.3866955217.

The spelling of 172238490 in words is "one hundred seventy-two million, two hundred thirty-eight thousand, four hundred ninety".