40079021 has 2 divisors, whose sum is σ = 40079022. Its totient is φ = 40079020.

The previous prime is 40078993. The next prime is 40079027. The reversal of 40079021 is 12097004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21252100 + 18826921 = 4610^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 40079021 - 2¹⁰ = 40077997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40079027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20039510 + 20039511.

It is an arithmetic number, because the mean of its divisors is an integer number (20039511).

Almost surely, 2^40079021 is an apocalyptic number.

It is an amenable number.

40079021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40079021 is an equidigital number, since it uses as much as digits as its factorization.

40079021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 40079021 is about 6330.7993966007. The cubic root of 40079021 is about 342.2202478795.

The spelling of 40079021 in words is "forty million, seventy-nine thousand, twenty-one".