999940237 has 4 divisors (see below), whose sum is σ = 1004232060. Its totient is φ = 995648416.

The previous prime is 999940229. The next prime is 999940273. The reversal of 999940237 is 732049999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 732049999 = 4441 ⋅164839.

It can be written as a sum of positive squares in 2 ways, for example, as 414977641 + 584962596 = 20371^2 + 24186^2 .

It is a cyclic number.

It is not a de Polignac number, because 999940237 - 2³ = 999940229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999940217) 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, 2145562 + ... + 2146027.

It is an arithmetic number, because the mean of its divisors is an integer number (251058015).

Almost surely, 2^999940237 is an apocalyptic number.

It is an amenable number.

999940237 is a deficient number, since it is larger than the sum of its proper divisors (4291823).

999940237 is a wasteful number, since it uses less digits than its factorization.

999940237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291822.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 999940237 is about 31621.8316515663. The cubic root of 999940237 is about 999.9800786031.

The spelling of 999940237 in words is "nine hundred ninety-nine million, nine hundred forty thousand, two hundred thirty-seven".