9979425 has 36 divisors (see below), whose sum is σ = 18932940. Its totient is φ = 5007360.

The previous prime is 9979399. The next prime is 9979433. The reversal of 9979425 is 5249799.

It can be written as a sum of positive squares in 6 ways, for example, as 144 + 9979281 = 12^2 + 3159^2 .

It is not a de Polignac number, because 9979425 - 2⁷ = 9979297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a d-powerful number, because it can be written as 9⁴ + 9⁴ + 7⁸ + 9⁴ + 4¹¹ + 2⁹ + 5³ .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2521 + ... + 5129.

It is an arithmetic number, because the mean of its divisors is an integer number (525915).

Almost surely, 2^9979425 is an apocalyptic number.

It is an amenable number.

9979425 is a deficient number, since it is larger than the sum of its proper divisors (8953515).

9979425 is a wasteful number, since it uses less digits than its factorization.

9979425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642 (or 2634 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 9979425 is about 3159.0227919406. The cubic root of 9979425 is about 215.2956092371.

It can be divided in two parts, 9979 and 425, that added together give a square (10404 = 102²).

The spelling of 9979425 in words is "nine million, nine hundred seventy-nine thousand, four hundred twenty-five".