40040421 has 16 divisors (see below), whose sum is σ = 54096000. Its totient is φ = 26342208.

The previous prime is 40040411. The next prime is 40040471. The reversal of 40040421 is 12404004.

It is not a de Polignac number, because 40040421 - 2⁷ = 40040293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40040421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114555 + ... + 114903.

It is an arithmetic number, because the mean of its divisors is an integer number (3381000).

Almost surely, 2^40040421 is an apocalyptic number.

It is an amenable number.

40040421 is a deficient number, since it is larger than the sum of its proper divisors (14055579).

40040421 is a wasteful number, since it uses less digits than its factorization.

40040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40040421 is about 6327.7500740785. The cubic root of 40040421 is about 342.1103487831.

Adding to 40040421 its reverse (12404004), we get a palindrome (52444425).

The spelling of 40040421 in words is "forty million, forty thousand, four hundred twenty-one".