38661493 has 4 divisors (see below), whose sum is σ = 41635468. Its totient is φ = 35687520.

The previous prime is 38661473. The next prime is 38661503. The reversal of 38661493 is 39416683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39416683 = 53 ⋅743711.

It can be written as a sum of positive squares in 2 ways, for example, as 5276209 + 33385284 = 2297^2 + 5778^2 .

It is a cyclic number.

It is not a de Polignac number, because 38661493 - 2¹⁷ = 38530421 is a prime.

It is a super-2 number, since 2×38661493² = 2989422081978098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38661463) 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, 1486968 + ... + 1486993.

It is an arithmetic number, because the mean of its divisors is an integer number (10408867).

Almost surely, 2^38661493 is an apocalyptic number.

It is an amenable number.

38661493 is a deficient number, since it is larger than the sum of its proper divisors (2973975).

38661493 is a wasteful number, since it uses less digits than its factorization.

38661493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2973974.

The product of its digits is 93312, while the sum is 40.

The square root of 38661493 is about 6217.8366816764. The cubic root of 38661493 is about 338.1371390095.

The spelling of 38661493 in words is "thirty-eight million, six hundred sixty-one thousand, four hundred ninety-three".