39964426 has 4 divisors (see below), whose sum is σ = 59946642. Its totient is φ = 19982212.

The previous prime is 39964423. The next prime is 39964447. The reversal of 39964426 is 62446993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62446993 = 7 ⋅8920999.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 1957201 = 6165^2 + 1399^2 .

It is not an unprimeable number, because it can be changed into a prime (39964423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9991105 + ... + 9991108.

Almost surely, 2^39964426 is an apocalyptic number.

39964426 is a deficient number, since it is larger than the sum of its proper divisors (19982216).

39964426 is a wasteful number, since it uses less digits than its factorization.

39964426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19982215.

The product of its digits is 279936, while the sum is 43.

The square root of 39964426 is about 6321.7423231258. The cubic root of 39964426 is about 341.8937747912.

The spelling of 39964426 in words is "thirty-nine million, nine hundred sixty-four thousand, four hundred twenty-six".