1358621640 has 128 divisors (see below), whose sum is σ = 4795200000. Its totient is φ = 340982784.

The previous prime is 1358621639. The next prime is 1358621651. The reversal of 1358621640 is 461268531.

It is a happy number.

1358621640 is a `hidden beast` number, since 1 + 3 + 5 + 8 + 6 + 2 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1358621595 and 1358621604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18640 + ... + 55359.

It is an arithmetic number, because the mean of its divisors is an integer number (37462500).

Almost surely, 2^1358621640 is an apocalyptic number.

1358621640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1358621640 is an abundant number, since it is smaller than the sum of its proper divisors (3436578360).

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

1358621640 is a wasteful number, since it uses less digits than its factorization.

1358621640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74036 (or 74026 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1358621640 is about 36859.4850750794. The cubic root of 1358621640 is about 1107.5572285870.

The spelling of 1358621640 in words is "one billion, three hundred fifty-eight million, six hundred twenty-one thousand, six hundred forty".