1864426040 has 64 divisors (see below), whose sum is σ = 4476902400. Its totient is φ = 696342528.

The previous prime is 1864426027. The next prime is 1864426073. The reversal of 1864426040 is 406244681.

It is a Cunningham number, because it is equal to 43179²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75566 + ... + 97154.

It is an arithmetic number, because the mean of its divisors is an integer number (69951600).

Almost surely, 2^1864426040 is an apocalyptic number.

1864426040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1864426040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2238451200).

1864426040 is an abundant number, since it is smaller than the sum of its proper divisors (2612476360).

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

1864426040 is a wasteful number, since it uses less digits than its factorization.

1864426040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21744 (or 21740 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 1864426040 is about 43178.9999884203. Note that the first 4 decimals coincide. The cubic root of 1864426040 is about 1230.7836546667.

The spelling of 1864426040 in words is "one billion, eight hundred sixty-four million, four hundred twenty-six thousand, forty".