400320047 has 2 divisors, whose sum is σ = 400320048. Its totient is φ = 400320046.

The previous prime is 400320017. The next prime is 400320073. The reversal of 400320047 is 740023004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400320047 - 2¹⁴ = 400303663 is a prime.

It is a super-2 number, since 2×400320047² = 320512280060164418, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400320007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200160023 + 200160024.

It is an arithmetic number, because the mean of its divisors is an integer number (200160024).

Almost surely, 2^400320047 is an apocalyptic number.

400320047 is a deficient number, since it is larger than the sum of its proper divisors (1).

400320047 is an equidigital number, since it uses as much as digits as its factorization.

400320047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 400320047 is about 20007.9995751699. Note that the first 3 decimals coincide. The cubic root of 400320047 is about 737.0027578790.

The spelling of 400320047 in words is "four hundred million, three hundred twenty thousand, forty-seven".