1264633989 has 8 divisors (see below), whose sum is σ = 1731751200. Its totient is φ = 820303056.

The previous prime is 1264633973. The next prime is 1264633991. The reversal of 1264633989 is 9893364621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1264633989 - 2⁴ = 1264633973 is a prime.

It is a super-2 number, since 2×1264633989² = 3198598252268104242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264633949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5696439 + ... + 5696660.

It is an arithmetic number, because the mean of its divisors is an integer number (216468900).

Almost surely, 2^1264633989 is an apocalyptic number.

It is an amenable number.

1264633989 is a deficient number, since it is larger than the sum of its proper divisors (467117211).

1264633989 is a wasteful number, since it uses less digits than its factorization.

1264633989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11393139.

The product of its digits is 1679616, while the sum is 51.

The square root of 1264633989 is about 35561.6927184295. The cubic root of 1264633989 is about 1081.4047760704.

The spelling of 1264633989 in words is "one billion, two hundred sixty-four million, six hundred thirty-three thousand, nine hundred eighty-nine".