400906247 has 4 divisors (see below), whose sum is σ = 458178576. Its totient is φ = 343633920.

The previous prime is 400906217. The next prime is 400906271. The reversal of 400906247 is 742609004.

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

It is not a de Polignac number, because 400906247 - 2⁶ = 400906183 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 (400906217) 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, 28636154 + ... + 28636167.

It is an arithmetic number, because the mean of its divisors is an integer number (114544644).

Almost surely, 2^400906247 is an apocalyptic number.

400906247 is a deficient number, since it is larger than the sum of its proper divisors (57272329).

400906247 is an equidigital number, since it uses as much as digits as its factorization.

400906247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57272328.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 400906247 is about 20022.6433569596. The cubic root of 400906247 is about 737.3623204448.

The spelling of 400906247 in words is "four hundred million, nine hundred six thousand, two hundred forty-seven".