40657239947809 has 3 divisors (see below), whose sum is σ = 40657246324113. Its totient is φ = 40657233571506.

The previous prime is 40657239947789. The next prime is 40657239947833. The reversal of 40657239947809 is 90874993275604.

The square root of 40657239947809 is 6376303.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 40657239947809 - 2¹⁵ = 40657239915041 is a prime.

It is a super-2 number, since 2×40657239947809² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40657239947869) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3188152 + ... + 9564454.

It is an arithmetic number, because the mean of its divisors is an integer number (13552415441371).

Almost surely, 2^{40657239947809} is an apocalyptic number.

40657239947809 is the 6376303-rd square number.

40657239947809 is the 3188152-nd centered octagonal number.

It is an amenable number.

40657239947809 is a deficient number, since it is larger than the sum of its proper divisors (6376304).

40657239947809 is an frugal number, since it uses more digits than its factorization.

40657239947809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12752606 (or 6376303 counting only the distinct ones).

The product of its (nonzero) digits is 823011840, while the sum is 73.

The spelling of 40657239947809 in words is "forty trillion, six hundred fifty-seven billion, two hundred thirty-nine million, nine hundred forty-seven thousand, eight hundred nine".