402420720 has 80 divisors (see below), whose sum is σ = 1343476512. Its totient is φ = 99056640.

The previous prime is 402420713. The next prime is 402420731. The reversal of 402420720 is 27024204.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61371 + ... + 67610.

Almost surely, 2^402420720 is an apocalyptic number.

402420720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402420720 is an abundant number, since it is smaller than the sum of its proper divisors (941055792).

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

402420720 is a wasteful number, since it uses less digits than its factorization.

402420720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129010 (or 129004 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 402420720 is about 20060.4267153019. The cubic root of 402420720 is about 738.2896462229.

Adding to 402420720 its reverse (27024204), we get a palindrome (429444924).

The spelling of 402420720 in words is "four hundred two million, four hundred twenty thousand, seven hundred twenty".