39420091 has 8 divisors (see below), whose sum is σ = 41809824. Its totient is φ = 37086720.

The previous prime is 39420089. The next prime is 39420113. The reversal of 39420091 is 19002493.

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 39420091 - 2¹ = 39420089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39420001) 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, 12646 + ... + 15451.

It is an arithmetic number, because the mean of its divisors is an integer number (5226228).

Almost surely, 2^39420091 is an apocalyptic number.

39420091 is a deficient number, since it is larger than the sum of its proper divisors (2389733).

39420091 is a wasteful number, since it uses less digits than its factorization.

39420091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28181.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 39420091 is about 6278.5421078464. The cubic root of 39420091 is about 340.3344200953.

The spelling of 39420091 in words is "thirty-nine million, four hundred twenty thousand, ninety-one".