40394820 has 24 divisors (see below), whose sum is σ = 113105664. Its totient is φ = 10771936.

The previous prime is 40394813. The next prime is 40394821. The reversal of 40394820 is 2849304.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (40394821) 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, 336564 + ... + 336683.

It is an arithmetic number, because the mean of its divisors is an integer number (4712736).

Almost surely, 2^40394820 is an apocalyptic number.

It is an amenable number.

40394820 is an abundant number, since it is smaller than the sum of its proper divisors (72710844).

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

40394820 is a wasteful number, since it uses less digits than its factorization.

40394820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673259 (or 673257 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 40394820 is about 6355.6919371537. The cubic root of 40394820 is about 343.1167285109.

It can be divided in two parts, 40394 and 820, that added together give a palindrome (41214).

The spelling of 40394820 in words is "forty million, three hundred ninety-four thousand, eight hundred twenty".