38921290 has 32 divisors (see below), whose sum is σ = 73560960. Its totient is φ = 14798784.

The previous prime is 38921287. The next prime is 38921293. The reversal of 38921290 is 9212983.

It is an interprime number because it is at equal distance from previous prime (38921287) and next prime (38921293).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (38921293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44881 + ... + 45739.

It is an arithmetic number, because the mean of its divisors is an integer number (2298780).

Almost surely, 2^38921290 is an apocalyptic number.

38921290 is a deficient number, since it is larger than the sum of its proper divisors (34639670).

38921290 is a wasteful number, since it uses less digits than its factorization.

38921290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 38921290 is about 6238.6929720896. The cubic root of 38921290 is about 338.8928519747.

The spelling of 38921290 in words is "thirty-eight million, nine hundred twenty-one thousand, two hundred ninety".