40070621 has 2 divisors, whose sum is σ = 40070622. Its totient is φ = 40070620.

The previous prime is 40070599. The next prime is 40070629. The reversal of 40070621 is 12607004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35868121 + 4202500 = 5989^2 + 2050^2 .

It is a cyclic number.

It is not a de Polignac number, because 40070621 - 2¹⁰ = 40069597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40070593 and 40070602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40070629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20035310 + 20035311.

It is an arithmetic number, because the mean of its divisors is an integer number (20035311).

Almost surely, 2^40070621 is an apocalyptic number.

It is an amenable number.

40070621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40070621 is an equidigital number, since it uses as much as digits as its factorization.

40070621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 40070621 is about 6330.1359385087. The cubic root of 40070621 is about 342.1963380229.

Adding to 40070621 its reverse (12607004), we get a palindrome (52677625).

The spelling of 40070621 in words is "forty million, seventy thousand, six hundred twenty-one".