4020403656400 has 60 divisors (see below), whose sum is σ = 9659512626624. Its totient is φ = 1608079408000.

The previous prime is 4020403656383. The next prime is 4020403656421. The reversal of 4020403656400 is 46563040204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7918185 + ... + 8410615.

Almost surely, 2^{4020403656400} is an apocalyptic number.

4020403656400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4020403656400 is an abundant number, since it is smaller than the sum of its proper divisors (5639108970224).

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

4020403656400 is a wasteful number, since it uses less digits than its factorization.

4020403656400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512860 (or 512849 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 4020403656400 its reverse (46563040204), we get a palindrome (4066966696604).

The spelling of 4020403656400 in words is "four trillion, twenty billion, four hundred three million, six hundred fifty-six thousand, four hundred".