1357747840 has 64 divisors (see below), whose sum is σ = 3436826760. Its totient is φ = 511148032.

The previous prime is 1357747817. The next prime is 1357747843. The reversal of 1357747840 is 487477531.

It can be written as a sum of positive squares in 4 ways, for example, as 1116629056 + 241118784 = 33416^2 + 15528^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1357747843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51517 + ... + 73276.

Almost surely, 2^1357747840 is an apocalyptic number.

1357747840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1357747840 is an abundant number, since it is smaller than the sum of its proper divisors (2079078920).

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

1357747840 is a wasteful number, since it uses less digits than its factorization.

1357747840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124829 (or 124817 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 46.

The square root of 1357747840 is about 36847.6300459066. The cubic root of 1357747840 is about 1107.3197351772.

The spelling of 1357747840 in words is "one billion, three hundred fifty-seven million, seven hundred forty-seven thousand, eight hundred forty".