400440613 has 8 divisors (see below), whose sum is σ = 414499680. Its totient is φ = 386398320.

The previous prime is 400440583. The next prime is 400440617. The reversal of 400440613 is 316044004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400440613 - 2⁵ = 400440581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400440617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62698 + ... + 68788.

It is an arithmetic number, because the mean of its divisors is an integer number (51812460).

Almost surely, 2^400440613 is an apocalyptic number.

It is an amenable number.

400440613 is a deficient number, since it is larger than the sum of its proper divisors (14059067).

400440613 is a wasteful number, since it uses less digits than its factorization.

400440613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8387.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 400440613 is about 20011.0122932349. The cubic root of 400440613 is about 737.0767391482.

Adding to 400440613 its reverse (316044004), we get a palindrome (716484617).

The spelling of 400440613 in words is "four hundred million, four hundred forty thousand, six hundred thirteen".