39954390 has 64 divisors (see below), whose sum is σ = 111421440. Its totient is φ = 8979840.

The previous prime is 39954389. The next prime is 39954391. The reversal of 39954390 is 9345993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (39954389) and next prime (39954391).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39954391) 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, 11251 + ... + 14369.

It is an arithmetic number, because the mean of its divisors is an integer number (1740960).

Almost surely, 2^39954390 is an apocalyptic number.

39954390 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 39954390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55710720).

39954390 is an abundant number, since it is smaller than the sum of its proper divisors (71467050).

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

39954390 is a wasteful number, since it uses less digits than its factorization.

39954390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197.

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 39954390 is about 6320.9485047736. The cubic root of 39954390 is about 341.8651532267.

It can be divided in two parts, 3995 and 4390, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 39954390 in words is "thirty-nine million, nine hundred fifty-four thousand, three hundred ninety".