1002172890 has 32 divisors (see below), whose sum is σ = 2406329856. Its totient is φ = 267122240.

The previous prime is 1002172877. The next prime is 1002172891. The reversal of 1002172890 is 982712001.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1002172891) 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, 71284 + ... + 84176.

It is an arithmetic number, because the mean of its divisors is an integer number (75197808).

Almost surely, 2^1002172890 is an apocalyptic number.

1002172890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1002172890 is an abundant number, since it is smaller than the sum of its proper divisors (1404156966).

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

1002172890 is a wasteful number, since it uses less digits than its factorization.

1002172890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15494.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 1002172890 is about 31657.1143662842. The cubic root of 1002172890 is about 1000.7237726934.

Adding to 1002172890 its reverse (982712001), we get a palindrome (1984884891).

The spelling of 1002172890 in words is "one billion, two million, one hundred seventy-two thousand, eight hundred ninety".