39771421 has 2 divisors, whose sum is σ = 39771422. Its totient is φ = 39771420.

The previous prime is 39771409. The next prime is 39771461. The reversal of 39771421 is 12417793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28622500 + 11148921 = 5350^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 39771421 - 2⁹ = 39770909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39771461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19885710 + 19885711.

It is an arithmetic number, because the mean of its divisors is an integer number (19885711).

Almost surely, 2^39771421 is an apocalyptic number.

It is an amenable number.

39771421 is a deficient number, since it is larger than the sum of its proper divisors (1).

39771421 is an equidigital number, since it uses as much as digits as its factorization.

39771421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 39771421 is about 6306.4586734553. The cubic root of 39771421 is about 341.3425035132.

The spelling of 39771421 in words is "thirty-nine million, seven hundred seventy-one thousand, four hundred twenty-one".