401669309 has 8 divisors (see below), whose sum is σ = 419670720. Its totient is φ = 383712736.

The previous prime is 401669293. The next prime is 401669311. The reversal of 401669309 is 903966104.

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 401669309 - 2⁴ = 401669293 is a prime.

It is a super-2 number, since 2×401669309² = 322676467585074962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401669339) 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, 7814 + ... + 29400.

It is an arithmetic number, because the mean of its divisors is an integer number (52458840).

Almost surely, 2^401669309 is an apocalyptic number.

It is an amenable number.

401669309 is a deficient number, since it is larger than the sum of its proper divisors (18001411).

401669309 is a wasteful number, since it uses less digits than its factorization.

401669309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22419.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 401669309 is about 20041.6892751085. The cubic root of 401669309 is about 737.8298416954.

The spelling of 401669309 in words is "four hundred one million, six hundred sixty-nine thousand, three hundred nine".