9400190921 has 4 divisors (see below), whose sum is σ = 10254753744. Its totient is φ = 8545628100.

The previous prime is 9400190893. The next prime is 9400190927. The reversal of 9400190921 is 1290910049.

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 a de Polignac number, because none of the positive numbers 2^k-9400190921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9400190927) 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, 427281395 + ... + 427281416.

It is an arithmetic number, because the mean of its divisors is an integer number (2563688436).

Almost surely, 2^9400190921 is an apocalyptic number.

It is an amenable number.

9400190921 is a deficient number, since it is larger than the sum of its proper divisors (854562823).

9400190921 is a wasteful number, since it uses less digits than its factorization.

9400190921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854562822.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 9400190921 is about 96954.5817432059. The cubic root of 9400190921 is about 2110.4685826929.

The spelling of 9400190921 in words is "nine billion, four hundred million, one hundred ninety thousand, nine hundred twenty-one".