39778020 has 96 divisors (see below), whose sum is σ = 130300800. Its totient is φ = 10046592.

The previous prime is 39778009. The next prime is 39778021. The reversal of 39778020 is 2087793.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (39778021) 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, 8322 + ... + 12198.

It is an arithmetic number, because the mean of its divisors is an integer number (1357300).

Almost surely, 2^39778020 is an apocalyptic number.

39778020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39778020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65150400).

39778020 is an abundant number, since it is smaller than the sum of its proper divisors (90522780).

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

39778020 is a wasteful number, since it uses less digits than its factorization.

39778020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914 (or 3906 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 39778020 is about 6306.9818455423. The cubic root of 39778020 is about 341.3613813452.

The spelling of 39778020 in words is "thirty-nine million, seven hundred seventy-eight thousand, twenty".