40290421 has 8 divisors (see below), whose sum is σ = 42476544. Its totient is φ = 38159760.

The previous prime is 40290409. The next prime is 40290463. The reversal of 40290421 is 12409204.

40290421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40290421 - 2⁷ = 40290293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40290392 and 40290401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40290721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12370 + ... + 15283.

It is an arithmetic number, because the mean of its divisors is an integer number (5309568).

Almost surely, 2^40290421 is an apocalyptic number.

It is an amenable number.

40290421 is a deficient number, since it is larger than the sum of its proper divisors (2186123).

40290421 is a wasteful number, since it uses less digits than its factorization.

40290421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27731.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40290421 is about 6347.4735919104. The cubic root of 40290421 is about 342.8208824334.

Adding to 40290421 its reverse (12409204), we get a palindrome (52699625).

The spelling of 40290421 in words is "forty million, two hundred ninety thousand, four hundred twenty-one".