400024066640 has 40 divisors (see below), whose sum is σ = 1014606498528. Its totient is φ = 145463296640.

The previous prime is 400024066613. The next prime is 400024066643. The reversal of 400024066640 is 46660420004.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 400024066597 and 400024066606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400024066643) 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, 227285522 + ... + 227287281.

Almost surely, 2^400024066640 is an apocalyptic number.

400024066640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400024066640 is an abundant number, since it is smaller than the sum of its proper divisors (614582431888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400024066640 is a wasteful number, since it uses less digits than its factorization.

400024066640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454572827 (or 454572821 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 400024066640 its reverse (46660420004), we get a palindrome (446684486644).

The spelling of 400024066640 in words is "four hundred billion, twenty-four million, sixty-six thousand, six hundred forty".