1269452890 has 36 divisors (see below), whose sum is σ = 2415682494. Its totient is φ = 480244608.

The previous prime is 1269452887. The next prime is 1269452893. The reversal of 1269452890 is 982549621.

It is an interprime number because it is at equal distance from previous prime (1269452887) and next prime (1269452893).

It can be written as a sum of positive squares in 3 ways, for example, as 1122049009 + 147403881 = 33497^2 + 12141^2 .

It is a super-2 number, since 2×1269452890² = 3223021279858704200, 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 1269452890.

It is not an unprimeable number, because it can be changed into a prime (1269452893) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2140434 + ... + 2141026.

Almost surely, 2^1269452890 is an apocalyptic number.

1269452890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1269452890 is a deficient number, since it is larger than the sum of its proper divisors (1146229604).

1269452890 is an frugal number, since it uses more digits than its factorization.

1269452890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 1269452890 is about 35629.3823971171. The cubic root of 1269452890 is about 1082.7766031472.

The spelling of 1269452890 in words is "one billion, two hundred sixty-nine million, four hundred fifty-two thousand, eight hundred ninety".