1264400447 has 8 divisors (see below), whose sum is σ = 1283143680. Its totient is φ = 1245683320.

The previous prime is 1264400419. The next prime is 1264400453. The reversal of 1264400447 is 7440044621.

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 1264400447 - 2¹² = 1264396351 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 (1264400407) 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, 104978 + ... + 116400.

It is an arithmetic number, because the mean of its divisors is an integer number (160392960).

Almost surely, 2^1264400447 is an apocalyptic number.

1264400447 is a deficient number, since it is larger than the sum of its proper divisors (18743233).

1264400447 is a wasteful number, since it uses less digits than its factorization.

1264400447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13053.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 1264400447 is about 35558.4089492204. The cubic root of 1264400447 is about 1081.3382037170.

The spelling of 1264400447 in words is "one billion, two hundred sixty-four million, four hundred thousand, four hundred forty-seven".