743653 has 4 divisors (see below), whose sum is σ = 750348. Its totient is φ = 736960.

The previous prime is 743609. The next prime is 743657. The reversal of 743653 is 356347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356347 = 37 ⋅9631.

It can be written as a sum of positive squares in 2 ways, for example, as 74529 + 669124 = 273^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 743653 - 2¹³ = 735461 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3178 + ... + 3403.

It is an arithmetic number, because the mean of its divisors is an integer number (187587).

2⁷⁴³⁶⁵³ is an apocalyptic number.

It is an amenable number.

743653 is a deficient number, since it is larger than the sum of its proper divisors (6695).

743653 is a wasteful number, since it uses less digits than its factorization.

743653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6694.

The product of its digits is 7560, while the sum is 28.

The square root of 743653 is about 862.3531759088. The cubic root of 743653 is about 90.5990084797.

It can be divided in two parts, 7 and 43653, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 743653 in words is "seven hundred forty-three thousand, six hundred fifty-three".