1440739 has 4 divisors (see below), whose sum is σ = 1445656. Its totient is φ = 1435824.

The previous prime is 1440737. The next prime is 1440763. The reversal of 1440739 is 9370441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9370441 = 127 ⋅73783.

It is a cyclic number.

It is not a de Polignac number, because 1440739 - 2¹ = 1440737 is a prime.

It is a super-2 number, since 2×1440739² = 4151457732242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1989 + ... + 2614.

It is an arithmetic number, because the mean of its divisors is an integer number (361414).

2^1440739 is an apocalyptic number.

1440739 is a deficient number, since it is larger than the sum of its proper divisors (4917).

1440739 is an equidigital number, since it uses as much as digits as its factorization.

1440739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4916.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1440739 is about 1200.3078771715. The cubic root of 1440739 is about 112.9436375406.

The spelling of 1440739 in words is "one million, four hundred forty thousand, seven hundred thirty-nine".