400432693 has 2 divisors, whose sum is σ = 400432694. Its totient is φ = 400432692.

The previous prime is 400432663. The next prime is 400432717. The reversal of 400432693 is 396234004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 284698129 + 115734564 = 16873^2 + 10758^2 .

It is a cyclic number.

It is not a de Polignac number, because 400432693 - 2¹³ = 400424501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400432663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200216346 + 200216347.

It is an arithmetic number, because the mean of its divisors is an integer number (200216347).

Almost surely, 2^400432693 is an apocalyptic number.

It is an amenable number.

400432693 is a deficient number, since it is larger than the sum of its proper divisors (1).

400432693 is an equidigital number, since it uses as much as digits as its factorization.

400432693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 400432693 is about 20010.8144012182. The cubic root of 400432693 is about 737.0718797624.

Adding to 400432693 its reverse (396234004), we get a palindrome (796666697).

The spelling of 400432693 in words is "four hundred million, four hundred thirty-two thousand, six hundred ninety-three".