400267649 has 4 divisors (see below), whose sum is σ = 400597764. Its totient is φ = 399937536.

The previous prime is 400267631. The next prime is 400267663. The reversal of 400267649 is 946762004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148474225 + 251793424 = 12185^2 + 15868^2 .

It is a cyclic number.

It is not a de Polignac number, because 400267649 - 2²⁸ = 131832193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400263649) 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, 163232 + ... + 165665.

It is an arithmetic number, because the mean of its divisors is an integer number (100149441).

Almost surely, 2^400267649 is an apocalyptic number.

It is an amenable number.

400267649 is a deficient number, since it is larger than the sum of its proper divisors (330115).

400267649 is a wasteful number, since it uses less digits than its factorization.

400267649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330114.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 400267649 is about 20006.6901060620. The cubic root of 400267649 is about 736.9706009787.

The spelling of 400267649 in words is "four hundred million, two hundred sixty-seven thousand, six hundred forty-nine".