40778623 has 2 divisors, whose sum is σ = 40778624. Its totient is φ = 40778622.

The previous prime is 40778587. The next prime is 40778651. The reversal of 40778623 is 32687704.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40778623 is a prime.

It is a super-2 number, since 2×40778623² = 3325792187552258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40778923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20389311 + 20389312.

It is an arithmetic number, because the mean of its divisors is an integer number (20389312).

Almost surely, 2^40778623 is an apocalyptic number.

40778623 is a deficient number, since it is larger than the sum of its proper divisors (1).

40778623 is an equidigital number, since it uses as much as digits as its factorization.

40778623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 40778623 is about 6385.8142002410. The cubic root of 40778623 is about 344.1999890609.

The spelling of 40778623 in words is "forty million, seven hundred seventy-eight thousand, six hundred twenty-three".