39540891 has 16 divisors (see below), whose sum is σ = 58736160. Its totient is φ = 23493120.

The previous prime is 39540889. The next prime is 39540899. The reversal of 39540891 is 19804593.

It is not a de Polignac number, because 39540891 - 2¹ = 39540889 is a prime.

It is a super-2 number, since 2×39540891² = 3126964122147762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (39540899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16350 + ... + 18611.

It is an arithmetic number, because the mean of its divisors is an integer number (3671010).

Almost surely, 2^39540891 is an apocalyptic number.

39540891 is a deficient number, since it is larger than the sum of its proper divisors (19195269).

39540891 is a wasteful number, since it uses less digits than its factorization.

39540891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35006.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 39540891 is about 6288.1548167964. The cubic root of 39540891 is about 340.6817089434.

The spelling of 39540891 in words is "thirty-nine million, five hundred forty thousand, eight hundred ninety-one".