38445990 has 64 divisors (see below), whose sum is σ = 101647872. Its totient is φ = 9228800.

The previous prime is 38445989. The next prime is 38445991. The reversal of 38445990 is 9954483.

It is an interprime number because it is at equal distance from previous prime (38445989) and next prime (38445991).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38445991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36775 + ... + 37805.

It is an arithmetic number, because the mean of its divisors is an integer number (1588248).

Almost surely, 2^38445990 is an apocalyptic number.

38445990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 38445990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50823936).

38445990 is an abundant number, since it is smaller than the sum of its proper divisors (63201882).

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

38445990 is a wasteful number, since it uses less digits than its factorization.

38445990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 38445990 is about 6200.4830456989. The cubic root of 38445990 is about 337.5076980411.

The spelling of 38445990 in words is "thirty-eight million, four hundred forty-five thousand, nine hundred ninety".