403671993 has 4 divisors (see below), whose sum is σ = 538229328. Its totient is φ = 269114660.

The previous prime is 403671973. The next prime is 403671997. The reversal of 403671993 is 399176304.

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 403671993 - 2⁹ = 403671481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (403671997) 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, 67278663 + ... + 67278668.

It is an arithmetic number, because the mean of its divisors is an integer number (134557332).

Almost surely, 2^403671993 is an apocalyptic number.

It is an amenable number.

403671993 is a deficient number, since it is larger than the sum of its proper divisors (134557335).

403671993 is a wasteful number, since it uses less digits than its factorization.

403671993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134557334.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 403671993 is about 20091.5901063107. The cubic root of 403671993 is about 739.0540585457.

The spelling of 403671993 in words is "four hundred three million, six hundred seventy-one thousand, nine hundred ninety-three".