40678821 has 8 divisors (see below), whose sum is σ = 60264960. Its totient is φ = 27119196.

The previous prime is 40678819. The next prime is 40678837. The reversal of 40678821 is 12887604.

Added to its reverse (12887604) it gives a triangular number (53566425 = T₁₀₃₅₀).

It is not a de Polignac number, because 40678821 - 2¹ = 40678819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40678871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753285 + ... + 753338.

It is an arithmetic number, because the mean of its divisors is an integer number (7533120).

Almost surely, 2^40678821 is an apocalyptic number.

It is an amenable number.

40678821 is a deficient number, since it is larger than the sum of its proper divisors (19586139).

40678821 is a wasteful number, since it uses less digits than its factorization.

40678821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506632 (or 1506626 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 40678821 is about 6377.9950611458. The cubic root of 40678821 is about 343.9189602007.

Adding to 40678821 its reverse (12887604), we get a triangular number (53566425 = T₁₀₃₅₀).

The spelling of 40678821 in words is "forty million, six hundred seventy-eight thousand, eight hundred twenty-one".