43649538 has 16 divisors (see below), whose sum is σ = 91094976. Its totient is φ = 13917200.

The previous prime is 43649537. The next prime is 43649539. The reversal of 43649538 is 83594634.

It is an interprime number because it is at equal distance from previous prime (43649537) and next prime (43649539).

It is a super-2 number, since 2×43649538² = 3810564335226888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43649538.

It is not an unprimeable number, because it can be changed into a prime (43649531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158013 + ... + 158288.

It is an arithmetic number, because the mean of its divisors is an integer number (5693436).

Almost surely, 2^43649538 is an apocalyptic number.

43649538 is an abundant number, since it is smaller than the sum of its proper divisors (47445438).

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

43649538 is a wasteful number, since it uses less digits than its factorization.

43649538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316329.

The product of its digits is 311040, while the sum is 42.

The square root of 43649538 is about 6606.7796996721. The cubic root of 43649538 is about 352.0950210499.

The spelling of 43649538 in words is "forty-three million, six hundred forty-nine thousand, five hundred thirty-eight".