403123007981 has 4 divisors (see below), whose sum is σ = 403126980672. Its totient is φ = 403119035292.

The previous prime is 403123007953. The next prime is 403123007983. The reversal of 403123007981 is 189700321304.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 403123007981 - 2¹⁴ = 403122991597 is a prime.

It is a super-2 number, since 2×403123007981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403123007983) 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, 1830035 + ... + 2038448.

It is an arithmetic number, because the mean of its divisors is an integer number (100781745168).

Almost surely, 2^403123007981 is an apocalyptic number.

It is an amenable number.

403123007981 is a deficient number, since it is larger than the sum of its proper divisors (3972691).

403123007981 is a wasteful number, since it uses less digits than its factorization.

403123007981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972690.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 403123007981 in words is "four hundred three billion, one hundred twenty-three million, seven thousand, nine hundred eighty-one".