1396529640 has 512 divisors, whose sum is σ = 5598720000. Its totient is φ = 305648640.

The previous prime is 1396529627. The next prime is 1396529647. The reversal of 1396529640 is 469256931.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1396529647) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 5191426 + ... + 5191694.

It is an arithmetic number, because the mean of its divisors is an integer number (10935000).

Almost surely, 2^1396529640 is an apocalyptic number.

1396529640 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 1396529640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2799360000).

1396529640 is an abundant number, since it is smaller than the sum of its proper divisors (4202190360).

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

1396529640 is a wasteful number, since it uses less digits than its factorization.

1396529640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 1396529640 is about 37370.1704571975. The cubic root of 1396529640 is about 1117.7638312253.

The spelling of 1396529640 in words is "one billion, three hundred ninety-six million, five hundred twenty-nine thousand, six hundred forty".