38640061 has 4 divisors (see below), whose sum is σ = 38853724. Its totient is φ = 38426400.

The previous prime is 38640059. The next prime is 38640067. The reversal of 38640061 is 16004683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16004683 = 37 ⋅432559.

It can be written as a sum of positive squares in 2 ways, for example, as 9803161 + 28836900 = 3131^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 38640061 - 2¹ = 38640059 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 (38640067) 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, 106560 + ... + 106921.

It is an arithmetic number, because the mean of its divisors is an integer number (9713431).

Almost surely, 2^38640061 is an apocalyptic number.

It is an amenable number.

38640061 is a deficient number, since it is larger than the sum of its proper divisors (213663).

38640061 is a wasteful number, since it uses less digits than its factorization.

38640061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213662.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 38640061 is about 6216.1130137732. The cubic root of 38640061 is about 338.0746453487.

The spelling of 38640061 in words is "thirty-eight million, six hundred forty thousand, sixty-one".