40129990 has 8 divisors (see below), whose sum is σ = 72234000. Its totient is φ = 16051992.

The previous prime is 40129987. The next prime is 40129993. The reversal of 40129990 is 9992104.

It is an interprime number because it is at equal distance from previous prime (40129987) and next prime (40129993).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×40129990² = 3220832194800200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40129993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006490 + ... + 2006509.

It is an arithmetic number, because the mean of its divisors is an integer number (9029250).

Almost surely, 2^40129990 is an apocalyptic number.

40129990 is a deficient number, since it is larger than the sum of its proper divisors (32104010).

40129990 is a wasteful number, since it uses less digits than its factorization.

40129990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013006.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 40129990 is about 6334.8235965968. The cubic root of 40129990 is about 342.3652550395.

The spelling of 40129990 in words is "forty million, one hundred twenty-nine thousand, nine hundred ninety".