1144764639 has 12 divisors (see below), whose sum is σ = 1662119056. Its totient is φ = 759220992.

The previous prime is 1144764637. The next prime is 1144764641. The reversal of 1144764639 is 9364674411.

1144764639 is a `hidden beast` number, since 1 + 1 + 4 + 4 + 7 + 6 + 4 + 639 = 666.

It is an interprime number because it is at equal distance from previous prime (1144764637) and next prime (1144764641).

It is not a de Polignac number, because 1144764639 - 2¹ = 1144764637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1144764594 and 1144764603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144764637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 327787 + ... + 331260.

Almost surely, 2^1144764639 is an apocalyptic number.

1144764639 is a deficient number, since it is larger than the sum of its proper divisors (517354417).

1144764639 is a wasteful number, since it uses less digits than its factorization.

1144764639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659246 (or 659243 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 1144764639 is about 33834.3706753946. The cubic root of 1144764639 is about 1046.0972697926.

The spelling of 1144764639 in words is "one billion, one hundred forty-four million, seven hundred sixty-four thousand, six hundred thirty-nine".