1269555940 has 12 divisors (see below), whose sum is σ = 2666067516. Its totient is φ = 507822368.

The previous prime is 1269555929. The next prime is 1269555979. The reversal of 1269555940 is 495559621.

It can be written as a sum of positive squares in 2 ways, for example, as 731594304 + 537961636 = 27048^2 + 23194^2 .

It is a super-2 number, since 2×1269555940² = 3223544569578567200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31738879 + ... + 31738918.

It is an arithmetic number, because the mean of its divisors is an integer number (222172293).

Almost surely, 2^1269555940 is an apocalyptic number.

1269555940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1269555940 is an abundant number, since it is smaller than the sum of its proper divisors (1396511576).

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

1269555940 is a wasteful number, since it uses less digits than its factorization.

1269555940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63477806 (or 63477804 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 46.

The square root of 1269555940 is about 35630.8285056635. The cubic root of 1269555940 is about 1082.8059010993.

It can be divided in two parts, 12695 and 55940, that added together give a triangular number (68635 = T₃₇₀).

The spelling of 1269555940 in words is "one billion, two hundred sixty-nine million, five hundred fifty-five thousand, nine hundred forty".