40272421 has 16 divisors (see below), whose sum is σ = 47568384. Its totient is φ = 33381504.

The previous prime is 40272403. The next prime is 40272443. The reversal of 40272421 is 12427204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40272421 - 2⁵ = 40272389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40272392 and 40272401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40272521) 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, 26340 + ... + 27826.

It is an arithmetic number, because the mean of its divisors is an integer number (2973024).

Almost surely, 2^40272421 is an apocalyptic number.

It is an amenable number.

40272421 is a deficient number, since it is larger than the sum of its proper divisors (7295963).

40272421 is a wasteful number, since it uses less digits than its factorization.

40272421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 40272421 is about 6346.0555465580. The cubic root of 40272421 is about 342.7698223642.

Adding to 40272421 its reverse (12427204), we get a palindrome (52699625).

The spelling of 40272421 in words is "forty million, two hundred seventy-two thousand, four hundred twenty-one".