40188497 has 2 divisors, whose sum is σ = 40188498. Its totient is φ = 40188496.

The previous prime is 40188443. The next prime is 40188503. The reversal of 40188497 is 79488104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 1263376 = 6239^2 + 1124^2 .

It is a cyclic number.

It is not a de Polignac number, because 40188497 - 2²⁰ = 39139921 is a prime.

It is a super-2 number, since 2×40188497² = 3230230582238018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40188427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20094248 + 20094249.

It is an arithmetic number, because the mean of its divisors is an integer number (20094249).

Almost surely, 2^40188497 is an apocalyptic number.

It is an amenable number.

40188497 is a deficient number, since it is larger than the sum of its proper divisors (1).

40188497 is an equidigital number, since it uses as much as digits as its factorization.

40188497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 40188497 is about 6339.4398017490. The cubic root of 40188497 is about 342.5315565788.

The spelling of 40188497 in words is "forty million, one hundred eighty-eight thousand, four hundred ninety-seven".