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400431193 is a prime number
BaseRepresentation
bin10111110111100…
…001100001011001
31000220111000022221
4113313201201121
51310002244233
6103422344041
712631415611
oct2767414131
91026430287
10400431193
1119603a978
12b212b021
1364c62946
143b277a41
152524b42d
hex17de1859

400431193 has 2 divisors, whose sum is σ = 400431194. Its totient is φ = 400431192.

The previous prime is 400431191. The next prime is 400431197. The reversal of 400431193 is 391134004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361456144 + 38975049 = 19012^2 + 6243^2 .

It is a cyclic number.

It is not a de Polignac number, because 400431193 - 21 = 400431191 is a prime.

Together with 400431191, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (400431191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200215596 + 200215597.

It is an arithmetic number, because the mean of its divisors is an integer number (200215597).

Almost surely, 2400431193 is an apocalyptic number.

It is an amenable number.

400431193 is a deficient number, since it is larger than the sum of its proper divisors (1).

400431193 is an equidigital number, since it uses as much as digits as its factorization.

400431193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 400431193 is about 20010.7769214491. The cubic root of 400431193 is about 737.0709594170.

Adding to 400431193 its reverse (391134004), we get a palindrome (791565197).

The spelling of 400431193 in words is "four hundred million, four hundred thirty-one thousand, one hundred ninety-three".