1139940169 has 9 divisors (see below), whose sum is σ = 1203772167. Its totient is φ = 1079335584.

The previous prime is 1139940167. The next prime is 1139940181. The reversal of 1139940169 is 9610499311.

The square root of 1139940169 is 33763.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 577681225 + 562258944 = 24035^2 + 23712^2 .

It is not a de Polignac number, because 1139940169 - 2¹ = 1139940167 is a prime.

It is a super-2 number, since 2×1139940169² = 2598927177799497122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1139940167) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 640609 + ... + 642385.

It is an arithmetic number, because the mean of its divisors is an integer number (133752463).

Almost surely, 2^1139940169 is an apocalyptic number.

1139940169 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1139940169 is the 33763-rd square number.

1139940169 is the 16882-nd centered octagonal number.

It is an amenable number.

1139940169 is a deficient number, since it is larger than the sum of its proper divisors (63831998).

1139940169 is an frugal number, since it uses more digits than its factorization.

1139940169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592 (or 1796 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The cubic root of 1139940169 is about 1044.6256510374.

The spelling of 1139940169 in words is "one billion, one hundred thirty-nine million, nine hundred forty thousand, one hundred sixty-nine".