40687973 has 2 divisors, whose sum is σ = 40687974. Its totient is φ = 40687972.

The previous prime is 40687967. The next prime is 40687979. The reversal of 40687973 is 37978604.

It is a balanced prime because it is at equal distance from previous prime (40687967) and next prime (40687979).

It can be written as a sum of positive squares in only one way, i.e., 37736449 + 2951524 = 6143^2 + 1718^2 .

It is a cyclic number.

It is not a de Polignac number, because 40687973 - 2⁶ = 40687909 is a prime.

It is a super-2 number, since 2×40687973² = 3311022293697458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40687979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20343986 + 20343987.

It is an arithmetic number, because the mean of its divisors is an integer number (20343987).

Almost surely, 2^40687973 is an apocalyptic number.

It is an amenable number.

40687973 is a deficient number, since it is larger than the sum of its proper divisors (1).

40687973 is an equidigital number, since it uses as much as digits as its factorization.

40687973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 40687973 is about 6378.7124876420. The cubic root of 40687973 is about 343.9447501181.

The spelling of 40687973 in words is "forty million, six hundred eighty-seven thousand, nine hundred seventy-three".