1437243921 has 9 divisors (see below), whose sum is σ = 2076183291. Its totient is φ = 958086792.

The previous prime is 1437243839. The next prime is 1437243931. The reversal of 1437243921 is 1293427341.

It is a happy number.

The square root of 1437243921 is 37911.

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

It can be written as a sum of positive squares in only one way, i.e., 138650625 + 1298593296 = 11775^2 + 36036^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1437243921 - 2¹¹ = 1437241873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1437243931) 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, 107415 + ... + 120051.

Almost surely, 2^1437243921 is an apocalyptic number.

1437243921 is the 37911-st square number.

1437243921 is the 18956-th centered octagonal number.

It is an amenable number.

1437243921 is a deficient number, since it is larger than the sum of its proper divisors (638939370).

1437243921 is an frugal number, since it uses more digits than its factorization.

1437243921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25280 (or 12640 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The cubic root of 1437243921 is about 1128.5223385328.

Multiplying 1437243921 by its sum of digits (36), we get a square (51740781156 = 227466²).

The spelling of 1437243921 in words is "one billion, four hundred thirty-seven million, two hundred forty-three thousand, nine hundred twenty-one".