401249921 has 8 divisors (see below), whose sum is σ = 404431104. Its totient is φ = 398081520.

The previous prime is 401249911. The next prime is 401249969. The reversal of 401249921 is 129942104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401249921 - 2²⁶ = 334141057 is a prime.

It is a super-2 number, since 2×401249921² = 322002998205012482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401249911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65531 + ... + 71391.

It is an arithmetic number, because the mean of its divisors is an integer number (50553888).

Almost surely, 2^401249921 is an apocalyptic number.

It is an amenable number.

401249921 is a deficient number, since it is larger than the sum of its proper divisors (3181183).

401249921 is a wasteful number, since it uses less digits than its factorization.

401249921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6391.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 401249921 is about 20031.2236520888. The cubic root of 401249921 is about 737.5729597838.

The spelling of 401249921 in words is "four hundred one million, two hundred forty-nine thousand, nine hundred twenty-one".