40004021540 has 48 divisors (see below), whose sum is σ = 96148827264. Its totient is φ = 13695782400.

The previous prime is 40004021537. The next prime is 40004021557. The reversal of 40004021540 is 4512040004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110021 + ... + 303500.

It is an arithmetic number, because the mean of its divisors is an integer number (2003100568).

Almost surely, 2^40004021540 is an apocalyptic number.

It is an amenable number.

40004021540 is an abundant number, since it is smaller than the sum of its proper divisors (56144805724).

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

40004021540 is a wasteful number, since it uses less digits than its factorization.

40004021540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414228 (or 414226 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 40004021540 its reverse (4512040004), we get a palindrome (44516061544).

The spelling of 40004021540 in words is "forty billion, four million, twenty-one thousand, five hundred forty".