999736425 has 120 divisors (see below), whose sum is σ = 1985839416. Its totient is φ = 495452160.

The previous prime is 999736351. The next prime is 999736427. The reversal of 999736425 is 524637999.

It can be written as a sum of positive squares in 12 ways, for example, as 139428864 + 860307561 = 11808^2 + 29331^2 .

It is not a de Polignac number, because 999736425 - 2¹⁴ = 999720041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999736427) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3889897 + ... + 3890153.

Almost surely, 2^999736425 is an apocalyptic number.

It is an amenable number.

999736425 is a deficient number, since it is larger than the sum of its proper divisors (986102991).

999736425 is a wasteful number, since it uses less digits than its factorization.

999736425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 395 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 999736425 is about 31618.6088403649. The cubic root of 999736425 is about 999.9121339464.

The spelling of 999736425 in words is "nine hundred ninety-nine million, seven hundred thirty-six thousand, four hundred twenty-five".