401269721 has 8 divisors (see below), whose sum is σ = 423964800. Its totient is φ = 378732240.

The previous prime is 401269709. The next prime is 401269727. The reversal of 401269721 is 127962104.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401269721 is a prime.

It is a super-2 number, since 2×401269721² = 322034777982835682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401269727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34145 + ... + 44366.

It is an arithmetic number, because the mean of its divisors is an integer number (52995600).

Almost surely, 2^401269721 is an apocalyptic number.

It is an amenable number.

401269721 is a deficient number, since it is larger than the sum of its proper divisors (22695079).

401269721 is a wasteful number, since it uses less digits than its factorization.

401269721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78799.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 401269721 is about 20031.7178744111. The cubic root of 401269721 is about 737.5850916278.

The spelling of 401269721 in words is "four hundred one million, two hundred sixty-nine thousand, seven hundred twenty-one".