1413721 has 9 divisors (see below), whose sum is σ = 1500733. Its totient is φ = 1331680.

The previous prime is 1413691. The next prime is 1413749. The reversal of 1413721 is 1273141.

Adding to 1413721 its reverse (1273141), we get a palindrome (2686862).

The square root of 1413721 is 1189.

It is a perfect power (a square), and thus also a powerful number.

1413721 is a nontrivial binomial coefficient, being equal to C(1682, 2).

It can be written as a sum of positive squares in 4 ways, for example, as 373321 + 1040400 = 611^2 + 1020^2 .

It is not a de Polignac number, because 1413721 - 2^{5} = 1413689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1413751) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 34461 + ... + 34501.

2^{1413721} is an apocalyptic number.

1413721 is the 1681-st triangular number, the 1189-th square number and also the 841-st hexagonal number.

1413721 is the 595-th centered octagonal number and also the 561-st centered nonagonal number.

It is an amenable number.

1413721 is a deficient number, since it is larger than the sum of its proper divisors (87012).

1413721 is an frugal number, since it uses more digits than its factorization.

1413721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 70 counting only the distinct ones).

The product of its digits is 168, while the sum is 19.

The cubic root of 1413721 is about 112.2331717506.

The spelling of 1413721 in words is "one million, four hundred thirteen thousand, seven hundred twenty-one".

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