40808437 has 2 divisors, whose sum is σ = 40808438. Its totient is φ = 40808436.

The previous prime is 40808429. The next prime is 40808459. The reversal of 40808437 is 73480804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36650916 + 4157521 = 6054^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 40808437 - 2³ = 40808429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40808137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20404218 + 20404219.

It is an arithmetic number, because the mean of its divisors is an integer number (20404219).

Almost surely, 2^40808437 is an apocalyptic number.

It is an amenable number.

40808437 is a deficient number, since it is larger than the sum of its proper divisors (1).

40808437 is an equidigital number, since it uses as much as digits as its factorization.

40808437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 40808437 is about 6388.1481667225. The cubic root of 40808437 is about 344.2838522701.

The spelling of 40808437 in words is "forty million, eight hundred eight thousand, four hundred thirty-seven".