40638551 has 16 divisors (see below), whose sum is σ = 45204480. Its totient is φ = 36359040.

The previous prime is 40638523. The next prime is 40638571. The reversal of 40638551 is 15583604.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40638551 - 2⁶ = 40638487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40638571) 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, 30440 + ... + 31746.

It is an arithmetic number, because the mean of its divisors is an integer number (2825280).

Almost surely, 2^40638551 is an apocalyptic number.

40638551 is a deficient number, since it is larger than the sum of its proper divisors (4565929).

40638551 is a wasteful number, since it uses less digits than its factorization.

40638551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 40638551 is about 6374.8373312580. The cubic root of 40638551 is about 343.8054352030.

The spelling of 40638551 in words is "forty million, six hundred thirty-eight thousand, five hundred fifty-one".