39661969 has 8 divisors (see below), whose sum is σ = 42094080. Its totient is φ = 37240896.

The previous prime is 39661943. The next prime is 39661981. The reversal of 39661969 is 96916693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39661969 - 2⁷ = 39661841 is a prime.

It is a super-2 number, since 2×39661969² = 3146143569913922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39661469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5352 + ... + 10390.

It is an arithmetic number, because the mean of its divisors is an integer number (5261760).

Almost surely, 2^39661969 is an apocalyptic number.

It is an amenable number.

39661969 is a deficient number, since it is larger than the sum of its proper divisors (2432111).

39661969 is a wasteful number, since it uses less digits than its factorization.

39661969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5519.

The product of its digits is 472392, while the sum is 49.

The square root of 39661969 is about 6297.7749245269. The cubic root of 39661969 is about 341.0290879691.

The spelling of 39661969 in words is "thirty-nine million, six hundred sixty-one thousand, nine hundred sixty-nine".