40639351 has 2 divisors, whose sum is σ = 40639352. Its totient is φ = 40639350.

The previous prime is 40639307. The next prime is 40639363. The reversal of 40639351 is 15393604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40639351 - 2⁷ = 40639223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40639301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20319675 + 20319676.

It is an arithmetic number, because the mean of its divisors is an integer number (20319676).

Almost surely, 2^40639351 is an apocalyptic number.

40639351 is a deficient number, since it is larger than the sum of its proper divisors (1).

40639351 is an equidigital number, since it uses as much as digits as its factorization.

40639351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 40639351 is about 6374.9000776483. The cubic root of 40639351 is about 343.8076912098.

The spelling of 40639351 in words is "forty million, six hundred thirty-nine thousand, three hundred fifty-one".