400149691 has 4 divisors (see below), whose sum is σ = 406709584. Its totient is φ = 393589800.

The previous prime is 400149683. The next prime is 400149697. The reversal of 400149691 is 196941004.

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

It is a cyclic number.

It is not a de Polignac number, because 400149691 - 2³ = 400149683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400149697) 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 3 ways as a sum of consecutive naturals, for example, 3279855 + ... + 3279976.

It is an arithmetic number, because the mean of its divisors is an integer number (101677396).

Almost surely, 2^400149691 is an apocalyptic number.

400149691 is a deficient number, since it is larger than the sum of its proper divisors (6559893).

400149691 is an equidigital number, since it uses as much as digits as its factorization.

400149691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6559892.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 400149691 is about 20003.7419249499. The cubic root of 400149691 is about 736.8981993251.

The spelling of 400149691 in words is "four hundred million, one hundred forty-nine thousand, six hundred ninety-one".