40209990 has 16 divisors (see below), whose sum is σ = 96504048. Its totient is φ = 10722656.

The previous prime is 40209989. The next prime is 40210039. The reversal of 40209990 is 9990204.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670137 + ... + 670196.

It is an arithmetic number, because the mean of its divisors is an integer number (6031503).

Almost surely, 2^40209990 is an apocalyptic number.

40209990 is an abundant number, since it is smaller than the sum of its proper divisors (56294058).

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

40209990 is a wasteful number, since it uses less digits than its factorization.

40209990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340343.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 40209990 is about 6341.1347564927. The cubic root of 40209990 is about 342.5926082003.

The spelling of 40209990 in words is "forty million, two hundred nine thousand, nine hundred ninety".