1264820989 has 8 divisors (see below), whose sum is σ = 1272938240. Its totient is φ = 1256726016.

The previous prime is 1264820983. The next prime is 1264821007. The reversal of 1264820989 is 9890284621.

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

It is a cyclic number.

It is not a de Polignac number, because 1264820989 - 2⁵ = 1264820957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264820983) 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, 116797 + ... + 127165.

It is an arithmetic number, because the mean of its divisors is an integer number (159117280).

Almost surely, 2^1264820989 is an apocalyptic number.

It is an amenable number.

1264820989 is a deficient number, since it is larger than the sum of its proper divisors (8117251).

1264820989 is a wasteful number, since it uses less digits than its factorization.

1264820989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11139.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 1264820989 is about 35564.3218549152. The cubic root of 1264820989 is about 1081.4580754777.

The spelling of 1264820989 in words is "one billion, two hundred sixty-four million, eight hundred twenty thousand, nine hundred eighty-nine".