1240899064 has 8 divisors (see below), whose sum is σ = 2326685760. Its totient is φ = 620449528.

The previous prime is 1240899061. The next prime is 1240899089. The reversal of 1240899064 is 4609980421.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1240899064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240899061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77556184 + ... + 77556199.

It is an arithmetic number, because the mean of its divisors is an integer number (290835720).

Almost surely, 2^1240899064 is an apocalyptic number.

It is an amenable number.

1240899064 is a deficient number, since it is larger than the sum of its proper divisors (1085786696).

1240899064 is a wasteful number, since it uses less digits than its factorization.

1240899064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155112389 (or 155112385 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 1240899064 is about 35226.3972611449. The cubic root of 1240899064 is about 1074.5966582031.

The spelling of 1240899064 in words is "one billion, two hundred forty million, eight hundred ninety-nine thousand, sixty-four".