1264357949 has 18 divisors (see below), whose sum is σ = 1362263994. Its totient is φ = 1173244800.

The previous prime is 1264357937. The next prime is 1264357961. The reversal of 1264357949 is 9497534621.

It is an interprime number because it is at equal distance from previous prime (1264357937) and next prime (1264357961).

It can be written as a sum of positive squares in 3 ways, for example, as 764522500 + 499835449 = 27650^2 + 22357^2 .

It is not a de Polignac number, because 1264357949 - 2⁴ = 1264357933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1264357897 and 1264357906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264357049) 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, 1803299 + ... + 1803999.

It is an arithmetic number, because the mean of its divisors is an integer number (75681333).

Almost surely, 2^1264357949 is an apocalyptic number.

It is an amenable number.

1264357949 is a deficient number, since it is larger than the sum of its proper divisors (97906045).

1264357949 is an frugal number, since it uses more digits than its factorization.

1264357949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 797 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 50.

The square root of 1264357949 is about 35557.8113640308. The cubic root of 1264357949 is about 1081.3260885611.

The spelling of 1264357949 in words is "one billion, two hundred sixty-four million, three hundred fifty-seven thousand, nine hundred forty-nine".