39769381 has 2 divisors, whose sum is σ = 39769382. Its totient is φ = 39769380.

The previous prime is 39769351. The next prime is 39769393. The reversal of 39769381 is 18396793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32878756 + 6890625 = 5734^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 39769381 - 2⁵ = 39769349 is a prime.

It is a super-2 number, since 2×39769381² = 3163207330246322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39769351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19884690 + 19884691.

It is an arithmetic number, because the mean of its divisors is an integer number (19884691).

Almost surely, 2^39769381 is an apocalyptic number.

It is an amenable number.

39769381 is a deficient number, since it is larger than the sum of its proper divisors (1).

39769381 is an equidigital number, since it uses as much as digits as its factorization.

39769381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 39769381 is about 6306.2969324319. The cubic root of 39769381 is about 341.3366672402.

It can be divided in two parts, 39 and 769381, that added together give a triangular number (769420 = T₁₂₄₀).

The spelling of 39769381 in words is "thirty-nine million, seven hundred sixty-nine thousand, three hundred eighty-one".