40421288 has 16 divisors (see below), whose sum is σ = 76063860. Its totient is φ = 20137600.

The previous prime is 40421287. The next prime is 40421299. The reversal of 40421288 is 88212404.

It can be written as a sum of positive squares in 2 ways, for example, as 32924644 + 7496644 = 5738^2 + 2738^2 .

It is a super-5 number, since 5×40421288⁵ (a number of 39 digits) contains 55555 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40421288.

It is not an unprimeable number, because it can be changed into a prime (40421287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6743 + ... + 11238.

Almost surely, 2^40421288 is an apocalyptic number.

It is an amenable number.

40421288 is a deficient number, since it is larger than the sum of its proper divisors (35642572).

40421288 is a wasteful number, since it uses less digits than its factorization.

40421288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18268 (or 18264 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 40421288 is about 6357.7738242250. The cubic root of 40421288 is about 343.1916525628.

The spelling of 40421288 in words is "forty million, four hundred twenty-one thousand, two hundred eighty-eight".