40509870 has 64 divisors (see below), whose sum is σ = 102795264. Its totient is φ = 10200960.

The previous prime is 40509841. The next prime is 40509899. The reversal of 40509870 is 7890504.

It is an interprime number because it is at equal distance from previous prime (40509841) and next prime (40509899).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39484 + ... + 40496.

It is an arithmetic number, because the mean of its divisors is an integer number (1606176).

Almost surely, 2^40509870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40509870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51397632).

40509870 is an abundant number, since it is smaller than the sum of its proper divisors (62285394).

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

40509870 is a wasteful number, since it uses less digits than its factorization.

40509870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 40509870 is about 6364.7364438757. The cubic root of 40509870 is about 343.4421676102.

The spelling of 40509870 in words is "forty million, five hundred nine thousand, eight hundred seventy".