40019957 has 2 divisors, whose sum is σ = 40019958. Its totient is φ = 40019956.

The previous prime is 40019953. The next prime is 40019981. The reversal of 40019957 is 75991004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40018276 + 1681 = 6326^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 40019957 - 2² = 40019953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40019953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20009978 + 20009979.

It is an arithmetic number, because the mean of its divisors is an integer number (20009979).

Almost surely, 2^40019957 is an apocalyptic number.

It is an amenable number.

40019957 is a deficient number, since it is larger than the sum of its proper divisors (1).

40019957 is an equidigital number, since it uses as much as digits as its factorization.

40019957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 40019957 is about 6326.1328629740. The cubic root of 40019957 is about 342.0520565288.

The spelling of 40019957 in words is "forty million, nineteen thousand, nine hundred fifty-seven".