40127421 has 4 divisors (see below), whose sum is σ = 53503232. Its totient is φ = 26751612.

The previous prime is 40127407. The next prime is 40127453. The reversal of 40127421 is 12472104.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40127421 - 2⁵ = 40127389 is a prime.

It is a super-2 number, since 2×40127421² = 3220419832222482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40127491) 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, 6687901 + ... + 6687906.

It is an arithmetic number, because the mean of its divisors is an integer number (13375808).

Almost surely, 2^40127421 is an apocalyptic number.

It is an amenable number.

40127421 is a deficient number, since it is larger than the sum of its proper divisors (13375811).

40127421 is a wasteful number, since it uses less digits than its factorization.

40127421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13375810.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 40127421 is about 6334.6208252744. The cubic root of 40127421 is about 342.3579491559.

Adding to 40127421 its reverse (12472104), we get a palindrome (52599525).

The spelling of 40127421 in words is "forty million, one hundred twenty-seven thousand, four hundred twenty-one".