1264861943 has 8 divisors (see below), whose sum is σ = 1276168608. Its totient is φ = 1253605024.

The previous prime is 1264861921. The next prime is 1264861951. The reversal of 1264861943 is 3491684621.

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 1264861943 - 2¹⁸ = 1264599799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1264861894 and 1264861903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264861903) 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, 39605 + ... + 64017.

It is an arithmetic number, because the mean of its divisors is an integer number (159521076).

Almost surely, 2^1264861943 is an apocalyptic number.

1264861943 is a deficient number, since it is larger than the sum of its proper divisors (11306665).

1264861943 is a wasteful number, since it uses less digits than its factorization.

1264861943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24873.

The product of its digits is 248832, while the sum is 44.

The square root of 1264861943 is about 35564.8976239213. The cubic root of 1264861943 is about 1081.4697476317.

The spelling of 1264861943 in words is "one billion, two hundred sixty-four million, eight hundred sixty-one thousand, nine hundred forty-three".