39964493 has 4 divisors (see below), whose sum is σ = 40083420. Its totient is φ = 39845568.

The previous prime is 39964489. The next prime is 39964511. The reversal of 39964493 is 39446993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39446993 = 4789 ⋅8237.

It can be written as a sum of positive squares in 2 ways, for example, as 3034564 + 36929929 = 1742^2 + 6077^2 .

It is a cyclic number.

It is not a de Polignac number, because 39964493 - 2² = 39964489 is a prime.

It is a Duffinian number.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 58958 + ... + 59631.

It is an arithmetic number, because the mean of its divisors is an integer number (10020855).

Almost surely, 2^39964493 is an apocalyptic number.

It is an amenable number.

39964493 is a deficient number, since it is larger than the sum of its proper divisors (118927).

39964493 is a wasteful number, since it uses less digits than its factorization.

39964493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118926.

The product of its digits is 629856, while the sum is 47.

The square root of 39964493 is about 6321.7476222956. The cubic root of 39964493 is about 341.8939658517.

The spelling of 39964493 in words is "thirty-nine million, nine hundred sixty-four thousand, four hundred ninety-three".