401394921 has 4 divisors (see below), whose sum is σ = 535193232. Its totient is φ = 267596612.

The previous prime is 401394911. The next prime is 401394943. The reversal of 401394921 is 129493104.

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 401394921 - 2⁶ = 401394857 is a prime.

It is a super-2 number, since 2×401394921² = 322235765209192482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401394901) 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, 66899151 + ... + 66899156.

It is an arithmetic number, because the mean of its divisors is an integer number (133798308).

Almost surely, 2^401394921 is an apocalyptic number.

It is an amenable number.

401394921 is a deficient number, since it is larger than the sum of its proper divisors (133798311).

401394921 is a wasteful number, since it uses less digits than its factorization.

401394921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133798310.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 401394921 is about 20034.8426747005. The cubic root of 401394921 is about 737.6617948576.

The spelling of 401394921 in words is "four hundred one million, three hundred ninety-four thousand, nine hundred twenty-one".