40649790 has 64 divisors (see below), whose sum is σ = 100618560. Its totient is φ = 10506240.

The previous prime is 40649789. The next prime is 40649801. The reversal of 40649790 is 9794604.

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, 177396 + ... + 177624.

It is an arithmetic number, because the mean of its divisors is an integer number (1572165).

Almost surely, 2^40649790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40649790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50309280).

40649790 is an abundant number, since it is smaller than the sum of its proper divisors (59968770).

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

40649790 is a wasteful number, since it uses less digits than its factorization.

40649790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 40649790 is about 6375.7187830079. The cubic root of 40649790 is about 343.8371265653.

The spelling of 40649790 in words is "forty million, six hundred forty-nine thousand, seven hundred ninety".