1264861894 has 8 divisors (see below), whose sum is σ = 1910026800. Its totient is φ = 628186296.

The previous prime is 1264861889. The next prime is 1264861903. The reversal of 1264861894 is 4981684621.

It is a happy number.

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

It is a super-2 number, since 2×1264861894² = 3199751221786534472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2121954 + ... + 2122549.

It is an arithmetic number, because the mean of its divisors is an integer number (238753350).

Almost surely, 2^1264861894 is an apocalyptic number.

1264861894 is a deficient number, since it is larger than the sum of its proper divisors (645164906).

1264861894 is a wasteful number, since it uses less digits than its factorization.

1264861894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244654.

The product of its digits is 663552, while the sum is 49.

The square root of 1264861894 is about 35564.8969350398. The cubic root of 1264861894 is about 1081.4697336665.

The spelling of 1264861894 in words is "one billion, two hundred sixty-four million, eight hundred sixty-one thousand, eight hundred ninety-four".