402441520 has 40 divisors (see below), whose sum is σ = 1007654256. Its totient is φ = 148593408.

The previous prime is 402441517. The next prime is 402441521. The reversal of 402441520 is 25144204.

It is a happy number.

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 = 402441491 and 402441500.

It is not an unprimeable number, because it can be changed into a prime (402441521) 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, 192442 + ... + 194521.

Almost surely, 2^402441520 is an apocalyptic number.

402441520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402441520 is an abundant number, since it is smaller than the sum of its proper divisors (605212736).

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

402441520 is a wasteful number, since it uses less digits than its factorization.

402441520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386989 (or 386983 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 402441520 is about 20060.9451422409. The cubic root of 402441520 is about 738.3023660452.

Adding to 402441520 its reverse (25144204), we get a palindrome (427585724).

The spelling of 402441520 in words is "four hundred two million, four hundred forty-one thousand, five hundred twenty".