38997978 has 8 divisors (see below), whose sum is σ = 77995968. Its totient is φ = 12999324.

The previous prime is 38997943. The next prime is 38997991. The reversal of 38997978 is 87979983.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

38997978 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3249826 + ... + 3249837.

It is an arithmetic number, because the mean of its divisors is an integer number (9749496).

Almost surely, 2^38997978 is an apocalyptic number.

38997978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38997978 is a wasteful number, since it uses less digits than its factorization.

38997978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6499668.

The product of its digits is 6858432, while the sum is 60.

The square root of 38997978 is about 6244.8361067365. The cubic root of 38997978 is about 339.1152834911.

The spelling of 38997978 in words is "thirty-eight million, nine hundred ninety-seven thousand, nine hundred seventy-eight".