38742091 has 4 divisors (see below), whose sum is σ = 39141592. Its totient is φ = 38342592.

The previous prime is 38742079. The next prime is 38742107. The reversal of 38742091 is 19024783.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38742091 - 2⁵ = 38742059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38742001) 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, 199605 + ... + 199798.

It is an arithmetic number, because the mean of its divisors is an integer number (9785398).

Almost surely, 2^38742091 is an apocalyptic number.

38742091 is a deficient number, since it is larger than the sum of its proper divisors (399501).

38742091 is an equidigital number, since it uses as much as digits as its factorization.

38742091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399500.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 38742091 is about 6224.3145004089. The cubic root of 38742091 is about 338.3719485370.

The spelling of 38742091 in words is "thirty-eight million, seven hundred forty-two thousand, ninety-one".