400016349 has 6 divisors (see below), whose sum is σ = 577801406. Its totient is φ = 266677560.

The previous prime is 400016327. The next prime is 400016359. The reversal of 400016349 is 943610004.

It can be written as a sum of positive squares in only one way, i.e., 395731449 + 4284900 = 19893^2 + 2070^2 .

It is not a de Polignac number, because 400016349 - 2²⁰ = 398967773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400016359) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22223122 + ... + 22223139.

Almost surely, 2^400016349 is an apocalyptic number.

It is an amenable number.

400016349 is a deficient number, since it is larger than the sum of its proper divisors (177785057).

400016349 is a wasteful number, since it uses less digits than its factorization.

400016349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44446267 (or 44446264 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 400016349 is about 20000.4087208237. The cubic root of 400016349 is about 736.8163379631.

The spelling of 400016349 in words is "four hundred million, sixteen thousand, three hundred forty-nine".