401004491 has 4 divisors (see below), whose sum is σ = 402421752. Its totient is φ = 399587232.

The previous prime is 401004473. The next prime is 401004511. The reversal of 401004491 is 194400104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401004491 - 2¹⁰ = 401003467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401004451) 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, 708206 + ... + 708771.

It is an arithmetic number, because the mean of its divisors is an integer number (100605438).

Almost surely, 2^401004491 is an apocalyptic number.

401004491 is a deficient number, since it is larger than the sum of its proper divisors (1417261).

401004491 is a wasteful number, since it uses less digits than its factorization.

401004491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417260.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 401004491 is about 20025.0965291057. The cubic root of 401004491 is about 737.4225469173.

Adding to 401004491 its reverse (194400104), we get a palindrome (595404595).

The spelling of 401004491 in words is "four hundred one million, four thousand, four hundred ninety-one".