1263449919 has 16 divisors (see below), whose sum is σ = 1739976704. Its totient is φ = 814644000.

The previous prime is 1263449893. The next prime is 1263449927. The reversal of 1263449919 is 9199443621.

It is a happy number.

It is not a de Polignac number, because 1263449919 - 2¹⁶ = 1263384383 is a prime.

It is a super-2 number, since 2×1263449919² = 3192611395642213122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263449969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218769 + ... + 224469.

It is an arithmetic number, because the mean of its divisors is an integer number (108748544).

Almost surely, 2^1263449919 is an apocalyptic number.

1263449919 is a deficient number, since it is larger than the sum of its proper divisors (476526785).

1263449919 is a wasteful number, since it uses less digits than its factorization.

1263449919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8118.

The product of its digits is 419904, while the sum is 48.

The square root of 1263449919 is about 35545.0407089372. The cubic root of 1263449919 is about 1081.0671661897.

The spelling of 1263449919 in words is "one billion, two hundred sixty-three million, four hundred forty-nine thousand, nine hundred nineteen".