9981407 has 4 divisors (see below), whose sum is σ = 9988440. Its totient is φ = 9974376.

The previous prime is 9981383. The next prime is 9981463. The reversal of 9981407 is 7041899.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9981407 - 2⁸ = 9981151 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981467) 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, 557 + ... + 4502.

It is an arithmetic number, because the mean of its divisors is an integer number (2497110).

Almost surely, 2^9981407 is an apocalyptic number.

9981407 is a deficient number, since it is larger than the sum of its proper divisors (7033).

9981407 is a wasteful number, since it uses less digits than its factorization.

9981407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 9981407 is about 3159.3364809719. The cubic root of 9981407 is about 215.3098614828.

The spelling of 9981407 in words is "nine million, nine hundred eighty-one thousand, four hundred seven".