40783997 has 2 divisors, whose sum is σ = 40783998. Its totient is φ = 40783996.

The previous prime is 40783961. The next prime is 40783999. The reversal of 40783997 is 79938704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38204761 + 2579236 = 6181^2 + 1606^2 .

It is a cyclic number.

It is not a de Polignac number, because 40783997 - 2¹⁸ = 40521853 is a prime.

It is a super-2 number, since 2×40783997² = 3326668822592018, which contains 22 as substring.

Together with 40783999, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 40783997 parts by 9031 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40783999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20391998 + 20391999.

It is an arithmetic number, because the mean of its divisors is an integer number (20391999).

Almost surely, 2^40783997 is an apocalyptic number.

It is an amenable number.

40783997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40783997 is an equidigital number, since it uses as much as digits as its factorization.

40783997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 40783997 is about 6386.2349627930. The cubic root of 40783997 is about 344.2151084981.

The spelling of 40783997 in words is "forty million, seven hundred eighty-three thousand, nine hundred ninety-seven".