40387553 has 2 divisors, whose sum is σ = 40387554. Its totient is φ = 40387552.

The previous prime is 40387547. The next prime is 40387573. The reversal of 40387553 is 35578304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39526369 + 861184 = 6287^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 40387553 - 2⁶ = 40387489 is a prime.

It is not a weakly prime, because it can be changed into another prime (40387573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20193776 + 20193777.

It is an arithmetic number, because the mean of its divisors is an integer number (20193777).

Almost surely, 2^40387553 is an apocalyptic number.

It is an amenable number.

40387553 is a deficient number, since it is larger than the sum of its proper divisors (1).

40387553 is an equidigital number, since it uses as much as digits as its factorization.

40387553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 40387553 is about 6355.1202191619. The cubic root of 40387553 is about 343.0961517900.

Subtracting from 40387553 its reverse (35578304), we obtain a square (4809249 = 2193²).

The spelling of 40387553 in words is "forty million, three hundred eighty-seven thousand, five hundred fifty-three".