38220591 has 4 divisors (see below), whose sum is σ = 50960792. Its totient is φ = 25480392.

The previous prime is 38220557. The next prime is 38220599. The reversal of 38220591 is 19502283.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19502283 = 3 ⋅6500761.

It is not a de Polignac number, because 38220591 - 2⁶ = 38220527 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 (38220599) 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, 6370096 + ... + 6370101.

It is an arithmetic number, because the mean of its divisors is an integer number (12740198).

Almost surely, 2^38220591 is an apocalyptic number.

38220591 is a deficient number, since it is larger than the sum of its proper divisors (12740201).

38220591 is a wasteful number, since it uses less digits than its factorization.

38220591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12740200.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 38220591 is about 6182.2804045109. The cubic root of 38220591 is about 336.8468311036.

The spelling of 38220591 in words is "thirty-eight million, two hundred twenty thousand, five hundred ninety-one".