402945640 has 32 divisors (see below), whose sum is σ = 907200000. Its totient is φ = 161076544.

The previous prime is 402945637. The next prime is 402945643. The reversal of 402945640 is 46549204.

It is an interprime number because it is at equal distance from previous prime (402945637) and next prime (402945643).

It is a junction number, because it is equal to n+sod(n) for n = 402945596 and 402945605.

It is not an unprimeable number, because it can be changed into a prime (402945643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118281 + ... + 121639.

It is an arithmetic number, because the mean of its divisors is an integer number (28350000).

Almost surely, 2^402945640 is an apocalyptic number.

402945640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402945640 is an abundant number, since it is smaller than the sum of its proper divisors (504254360).

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

402945640 is a wasteful number, since it uses less digits than its factorization.

402945640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369 (or 6365 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 402945640 is about 20073.5059219858. The cubic root of 402945640 is about 738.6105165620.

The spelling of 402945640 in words is "four hundred two million, nine hundred forty-five thousand, six hundred forty".