39990623 has 8 divisors (see below), whose sum is σ = 41461680. Its totient is φ = 38525760.

The previous prime is 39990607. The next prime is 39990653. The reversal of 39990623 is 32609993.

It is a happy number.

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 39990623 - 2⁴ = 39990607 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 (39990653) 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, 14603 + ... + 17123.

It is an arithmetic number, because the mean of its divisors is an integer number (5182710).

Almost surely, 2^39990623 is an apocalyptic number.

39990623 is a deficient number, since it is larger than the sum of its proper divisors (1471057).

39990623 is a wasteful number, since it uses less digits than its factorization.

39990623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 39990623 is about 6323.8139599454. The cubic root of 39990623 is about 341.9684631727.

The spelling of 39990623 in words is "thirty-nine million, nine hundred ninety thousand, six hundred twenty-three".