1017899172 has 36 divisors (see below), whose sum is σ = 2577776656. Its totient is φ = 338672880.

The previous prime is 1017899161. The next prime is 1017899173. The reversal of 1017899172 is 2719987101.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1017899172² = 2072237448716571168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1017899173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6154 + ... + 45537.

Almost surely, 2^1017899172 is an apocalyptic number.

1017899172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1017899172 is an abundant number, since it is smaller than the sum of its proper divisors (1559877484).

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

1017899172 is a wasteful number, since it uses less digits than its factorization.

1017899172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52248 (or 52243 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 45.

The square root of 1017899172 is about 31904.5321545388. The cubic root of 1017899172 is about 1005.9311426639.

The spelling of 1017899172 in words is "one billion, seventeen million, eight hundred ninety-nine thousand, one hundred seventy-two".