40639746 has 64 divisors (see below), whose sum is σ = 98795520. Its totient is φ = 10886400.

The previous prime is 40639693. The next prime is 40639763. The reversal of 40639746 is 64793604.

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, 101146 + ... + 101546.

It is an arithmetic number, because the mean of its divisors is an integer number (1543680).

Almost surely, 2^40639746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40639746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49397760).

40639746 is an abundant number, since it is smaller than the sum of its proper divisors (58155774).

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

40639746 is a wasteful number, since it uses less digits than its factorization.

40639746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 40639746 is about 6374.9310584508. The cubic root of 40639746 is about 343.8088051022.

It can be divided in two parts, 4063974 and 6, that multiplied together give a square (24383844 = 4938²).

The spelling of 40639746 in words is "forty million, six hundred thirty-nine thousand, seven hundred forty-six".