40426921 has 2 divisors, whose sum is σ = 40426922. Its totient is φ = 40426920.

The previous prime is 40426891. The next prime is 40426931. The reversal of 40426921 is 12962404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23088025 + 17338896 = 4805^2 + 4164^2 .

It is a cyclic number.

It is not a de Polignac number, because 40426921 - 2⁹ = 40426409 is a prime.

It is equal to p_2458081 and since 40426921 and 2458081 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40426921.

It is not a weakly prime, because it can be changed into another prime (40426931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20213460 + 20213461.

It is an arithmetic number, because the mean of its divisors is an integer number (20213461).

Almost surely, 2^40426921 is an apocalyptic number.

It is an amenable number.

40426921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40426921 is an equidigital number, since it uses as much as digits as its factorization.

40426921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 40426921 is about 6358.2168097667. The cubic root of 40426921 is about 343.2075939052.

The spelling of 40426921 in words is "forty million, four hundred twenty-six thousand, nine hundred twenty-one".