981907 has 4 divisors (see below), whose sum is σ = 984040. Its totient is φ = 979776.

The previous prime is 981889. The next prime is 981913. The reversal of 981907 is 709189.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981907 is a prime.

It is a Duffinian number.

981907 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (981947) 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, 57 + ... + 1402.

It is an arithmetic number, because the mean of its divisors is an integer number (246010).

2⁹⁸¹⁹⁰⁷ is an apocalyptic number.

981907 is a deficient number, since it is larger than the sum of its proper divisors (2133).

981907 is a wasteful number, since it uses less digits than its factorization.

981907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 981907 is about 990.9122060001. The cubic root of 981907 is about 99.3932256961.

The spelling of 981907 in words is "nine hundred eighty-one thousand, nine hundred seven".