403663920 has 160 divisors (see below), whose sum is σ = 1378840320. Its totient is φ = 96875520.

The previous prime is 403663913. The next prime is 403663933. The reversal of 403663920 is 29366304.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281766 + ... + 283194.

It is an arithmetic number, because the mean of its divisors is an integer number (8617752).

Almost surely, 2^403663920 is an apocalyptic number.

403663920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 403663920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689420160).

403663920 is an abundant number, since it is smaller than the sum of its proper divisors (975176400).

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

403663920 is a wasteful number, since it uses less digits than its factorization.

403663920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 403663920 is about 20091.3892003515. The cubic root of 403663920 is about 739.0491317542.

The spelling of 403663920 in words is "four hundred three million, six hundred sixty-three thousand, nine hundred twenty".