400431049 has 2 divisors, whose sum is σ = 400431050. Its totient is φ = 400431048.

The previous prime is 400430941. The next prime is 400431071. The reversal of 400431049 is 940134004.

It is a happy number.

Together with previous prime (400430941) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385415424 + 15015625 = 19632^2 + 3875^2 .

It is a cyclic number.

It is not a de Polignac number, because 400431049 - 2²⁵ = 366876617 is a prime.

It is not a weakly prime, because it can be changed into another prime (400431079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200215524 + 200215525.

It is an arithmetic number, because the mean of its divisors is an integer number (200215525).

Almost surely, 2^400431049 is an apocalyptic number.

It is an amenable number.

400431049 is a deficient number, since it is larger than the sum of its proper divisors (1).

400431049 is an equidigital number, since it uses as much as digits as its factorization.

400431049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 400431049 is about 20010.7733233876. The cubic root of 400431049 is about 737.0708710637.

It can be divided in two parts, 4004 and 31049, that added together give a palindrome (35053).

The spelling of 400431049 in words is "four hundred million, four hundred thirty-one thousand, forty-nine".