39864969 has 24 divisors (see below), whose sum is σ = 58785480. Its totient is φ = 26028288.

The previous prime is 39864967. The next prime is 39864971. The reversal of 39864969 is 96946893.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (39864967) and next prime (39864971).

It can be written as a sum of positive squares in 4 ways, for example, as 927369 + 38937600 = 963^2 + 6240^2 .

It is not a de Polignac number, because 39864969 - 2¹ = 39864967 is a prime.

It is a super-2 number, since 2×39864969² = 3178431506741922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39864967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125599 + ... + 125915.

It is an arithmetic number, because the mean of its divisors is an integer number (2449395).

Almost surely, 2^39864969 is an apocalyptic number.

It is an amenable number.

39864969 is a deficient number, since it is larger than the sum of its proper divisors (18920511).

39864969 is a wasteful number, since it uses less digits than its factorization.

39864969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 566 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 39864969 is about 6313.8711580139. The cubic root of 39864969 is about 341.6099225481.

The spelling of 39864969 in words is "thirty-nine million, eight hundred sixty-four thousand, nine hundred sixty-nine".