39988131 has 8 divisors (see below), whose sum is σ = 56453904. Its totient is φ = 25090560.

The previous prime is 39988127. The next prime is 39988133. The reversal of 39988131 is 13188993.

It is a happy number.

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

It is not a de Polignac number, because 39988131 - 2² = 39988127 is a prime.

It is a super-2 number, since 2×39988131² = 3198101241746322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39988133) 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, 391990 + ... + 392091.

It is an arithmetic number, because the mean of its divisors is an integer number (7056738).

Almost surely, 2^39988131 is an apocalyptic number.

39988131 is a deficient number, since it is larger than the sum of its proper divisors (16465773).

39988131 is a wasteful number, since it uses less digits than its factorization.

39988131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784101.

The product of its digits is 46656, while the sum is 42.

The square root of 39988131 is about 6323.6169238815. The cubic root of 39988131 is about 341.9613598149.

The spelling of 39988131 in words is "thirty-nine million, nine hundred eighty-eight thousand, one hundred thirty-one".