402001540 has 24 divisors (see below), whose sum is σ = 844585560. Its totient is φ = 160727808.

The previous prime is 402001517. The next prime is 402001573. The reversal of 402001540 is 45100204.

It can be written as a sum of positive squares in 4 ways, for example, as 233417284 + 168584256 = 15278^2 + 12984^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72714 + ... + 78046.

It is an arithmetic number, because the mean of its divisors is an integer number (35191065).

Almost surely, 2^402001540 is an apocalyptic number.

It is an amenable number.

402001540 is an abundant number, since it is smaller than the sum of its proper divisors (442584020).

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

402001540 is a wasteful number, since it uses less digits than its factorization.

402001540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9111 (or 9109 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 402001540 is about 20049.9760598361. The cubic root of 402001540 is about 738.0332116379.

Adding to 402001540 its reverse (45100204), we get a palindrome (447101744).

The spelling of 402001540 in words is "four hundred two million, one thousand, five hundred forty".