1172288890 has 16 divisors (see below), whose sum is σ = 2234245032. Its totient is φ = 441332224.

The previous prime is 1172288879. The next prime is 1172288947. The reversal of 1172288890 is 988822711.

It can be written as a sum of positive squares in 4 ways, for example, as 1158517369 + 13771521 = 34037^2 + 3711^2 .

It is a super-2 number, since 2×1172288890² = 2748522483234864200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1172288890.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3447739 + ... + 3448078.

Almost surely, 2^1172288890 is an apocalyptic number.

1172288890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1172288890 is a deficient number, since it is larger than the sum of its proper divisors (1061956142).

1172288890 is a wasteful number, since it uses less digits than its factorization.

1172288890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6895841.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 1172288890 is about 34238.7045607745. The cubic root of 1172288890 is about 1054.4149373183.

The spelling of 1172288890 in words is "one billion, one hundred seventy-two million, two hundred eighty-eight thousand, eight hundred ninety".