39497621 has 2 divisors, whose sum is σ = 39497622. Its totient is φ = 39497620.

The previous prime is 39497617. The next prime is 39497657. The reversal of 39497621 is 12679493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31516996 + 7980625 = 5614^2 + 2825^2 .

It is a cyclic number.

It is not a de Polignac number, because 39497621 - 2² = 39497617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39497021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19748810 + 19748811.

It is an arithmetic number, because the mean of its divisors is an integer number (19748811).

Almost surely, 2^39497621 is an apocalyptic number.

It is an amenable number.

39497621 is a deficient number, since it is larger than the sum of its proper divisors (1).

39497621 is an equidigital number, since it uses as much as digits as its factorization.

39497621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 39497621 is about 6284.7132790605. The cubic root of 39497621 is about 340.5573930969.

The spelling of 39497621 in words is "thirty-nine million, four hundred ninety-seven thousand, six hundred twenty-one".