38428649 has 4 divisors (see below), whose sum is σ = 43918464. Its totient is φ = 32938836.

The previous prime is 38428631. The next prime is 38428661. The reversal of 38428649 is 94682483.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94682483 = 7 ⋅13526069.

It is not a de Polignac number, because 38428649 - 2¹² = 38424553 is a prime.

It is a super-2 number, since 2×38428649² = 2953522127930402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38428669) 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, 2744897 + ... + 2744910.

It is an arithmetic number, because the mean of its divisors is an integer number (10979616).

Almost surely, 2^38428649 is an apocalyptic number.

It is an amenable number.

38428649 is a deficient number, since it is larger than the sum of its proper divisors (5489815).

38428649 is an equidigital number, since it uses as much as digits as its factorization.

38428649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5489814.

The product of its digits is 331776, while the sum is 44.

The square root of 38428649 is about 6199.0845291865. The cubic root of 38428649 is about 337.4569463142.

The spelling of 38428649 in words is "thirty-eight million, four hundred twenty-eight thousand, six hundred forty-nine".