39844890 has 24 divisors (see below), whose sum is σ = 103596948. Its totient is φ = 10625280.

The previous prime is 39844877. The next prime is 39844891. The reversal of 39844890 is 9844893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33837489 + 6007401 = 5817^2 + 2451^2 .

It is a super-2 number, since 2×39844890² = 3175230518224200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (39844891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221271 + ... + 221450.

Almost surely, 2^39844890 is an apocalyptic number.

39844890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

39844890 is an abundant number, since it is smaller than the sum of its proper divisors (63752058).

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

39844890 is a wasteful number, since it uses less digits than its factorization.

39844890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442734 (or 442731 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 39844890 is about 6312.2808872863. The cubic root of 39844890 is about 341.5525594235.

The spelling of 39844890 in words is "thirty-nine million, eight hundred forty-four thousand, eight hundred ninety".