981640403 has 8 divisors (see below), whose sum is σ = 985748400. Its totient is φ = 977540608.

The previous prime is 981640397. The next prime is 981640427. The reversal of 981640403 is 304046189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 981640403 - 2⁸ = 981640147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981640433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358343 + ... + 361071.

It is an arithmetic number, because the mean of its divisors is an integer number (123218550).

Almost surely, 2^981640403 is an apocalyptic number.

981640403 is a deficient number, since it is larger than the sum of its proper divisors (4107997).

981640403 is a wasteful number, since it uses less digits than its factorization.

981640403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 981640403 is about 31331.1411059348. The cubic root of 981640403 is about 993.8422948283.

The spelling of 981640403 in words is "nine hundred eighty-one million, six hundred forty thousand, four hundred three".