39149821 has 2 divisors, whose sum is σ = 39149822. Its totient is φ = 39149820.

The previous prime is 39149809. The next prime is 39149833. The reversal of 39149821 is 12894193.

It is a balanced prime because it is at equal distance from previous prime (39149809) and next prime (39149833).

It can be written as a sum of positive squares in only one way, i.e., 31248100 + 7901721 = 5590^2 + 2811^2 .

It is a cyclic number.

It is not a de Polignac number, because 39149821 - 2¹⁵ = 39117053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39149801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19574910 + 19574911.

It is an arithmetic number, because the mean of its divisors is an integer number (19574911).

Almost surely, 2^39149821 is an apocalyptic number.

It is an amenable number.

39149821 is a deficient number, since it is larger than the sum of its proper divisors (1).

39149821 is an equidigital number, since it uses as much as digits as its factorization.

39149821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 39149821 is about 6256.9817803794. The cubic root of 39149821 is about 339.5548412878.

The spelling of 39149821 in words is "thirty-nine million, one hundred forty-nine thousand, eight hundred twenty-one".