743661 has 10 divisors (see below), whose sum is σ = 1111022. Its totient is φ = 495720.

The previous prime is 743657. The next prime is 743669. The reversal of 743661 is 166347.

It can be written as a sum of positive squares in only one way, i.e., 670761 + 72900 = 819^2 + 270^2 .

It is not a de Polignac number, because 743661 - 2² = 743657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 743661.

It is not an unprimeable number, because it can be changed into a prime (743669) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4510 + ... + 4671.

2⁷⁴³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

743661 is a deficient number, since it is larger than the sum of its proper divisors (367361).

743661 is an equidigital number, since it uses as much as digits as its factorization.

743661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9193 (or 9184 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 743661 is about 862.3578143671. The cubic root of 743661 is about 90.5993333577.

The spelling of 743661 in words is "seven hundred forty-three thousand, six hundred sixty-one".