400020693 has 32 divisors (see below), whose sum is σ = 586776960. Its totient is φ = 241274880.

The previous prime is 400020689. The next prime is 400020697. The reversal of 400020693 is 396020004.

It is an interprime number because it is at equal distance from previous prime (400020689) and next prime (400020697).

It is not a de Polignac number, because 400020693 - 2² = 400020689 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400020697) 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 in 31 ways as a sum of consecutive naturals, for example, 453613 + ... + 454493.

It is an arithmetic number, because the mean of its divisors is an integer number (18336780).

Almost surely, 2^400020693 is an apocalyptic number.

It is an amenable number.

400020693 is a deficient number, since it is larger than the sum of its proper divisors (186756267).

400020693 is a wasteful number, since it uses less digits than its factorization.

400020693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 400020693 is about 20000.5173183095. The cubic root of 400020693 is about 736.8190051196.

Adding to 400020693 its reverse (396020004), we get a palindrome (796040697).

The spelling of 400020693 in words is "four hundred million, twenty thousand, six hundred ninety-three".