1440671709 has 16 divisors (see below), whose sum is σ = 1953825344. Its totient is φ = 944006400.

The previous prime is 1440671689. The next prime is 1440671767. The reversal of 1440671709 is 9071760441.

It is not a de Polignac number, because 1440671709 - 2⁷ = 1440671581 is a prime.

It is a super-2 number, since 2×1440671709² = 4151069946225961362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440671009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393642 + ... + 397284.

It is an arithmetic number, because the mean of its divisors is an integer number (122114084).

Almost surely, 2^1440671709 is an apocalyptic number.

It is an amenable number.

1440671709 is a deficient number, since it is larger than the sum of its proper divisors (513153635).

1440671709 is a wasteful number, since it uses less digits than its factorization.

1440671709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 1440671709 is about 37956.1814333318. The cubic root of 1440671709 is about 1129.4187913547.

The spelling of 1440671709 in words is "one billion, four hundred forty million, six hundred seventy-one thousand, seven hundred nine".