40213997 has 2 divisors, whose sum is σ = 40213998. Its totient is φ = 40213996.

The previous prime is 40213973. The next prime is 40214011. The reversal of 40213997 is 79931204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36348841 + 3865156 = 6029^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 40213997 - 2⁶ = 40213933 is a prime.

It is a super-3 number, since 3×40213997³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40213297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20106998 + 20106999.

It is an arithmetic number, because the mean of its divisors is an integer number (20106999).

Almost surely, 2^40213997 is an apocalyptic number.

It is an amenable number.

40213997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40213997 is an equidigital number, since it uses as much as digits as its factorization.

40213997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 40213997 is about 6341.4507015351. The cubic root of 40213997 is about 342.6039878183.

The spelling of 40213997 in words is "forty million, two hundred thirteen thousand, nine hundred ninety-seven".