400121287 has 2 divisors, whose sum is σ = 400121288. Its totient is φ = 400121286.

The previous prime is 400121263. The next prime is 400121311. The reversal of 400121287 is 782121004.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (400121263) and next prime (400121311).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400121287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400122287) 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 as a sum of consecutive naturals, namely, 200060643 + 200060644.

It is an arithmetic number, because the mean of its divisors is an integer number (200060644).

Almost surely, 2^400121287 is an apocalyptic number.

400121287 is a deficient number, since it is larger than the sum of its proper divisors (1).

400121287 is an equidigital number, since it uses as much as digits as its factorization.

400121287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 400121287 is about 20003.0319451827. The cubic root of 400121287 is about 736.8807630571.

The spelling of 400121287 in words is "four hundred million, one hundred twenty-one thousand, two hundred eighty-seven".