373663921 has 4 divisors (see below), whose sum is σ = 373903344. Its totient is φ = 373424500.

The previous prime is 373663907. The next prime is 373663949. The reversal of 373663921 is 129366373.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129366373 = 83 ⋅1558631.

It is a cyclic number.

It is not a de Polignac number, because 373663921 - 2⁷ = 373663793 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (373663321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117355 + ... + 120496.

It is an arithmetic number, because the mean of its divisors is an integer number (93475836).

Almost surely, 2^373663921 is an apocalyptic number.

It is an amenable number.

373663921 is a deficient number, since it is larger than the sum of its proper divisors (239423).

373663921 is a wasteful number, since it uses less digits than its factorization.

373663921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239422.

The product of its digits is 122472, while the sum is 40.

The square root of 373663921 is about 19330.3885372229. The cubic root of 373663921 is about 720.2673396378.

The spelling of 373663921 in words is "three hundred seventy-three million, six hundred sixty-three thousand, nine hundred twenty-one".