1393661952 has 72 divisors (see below), whose sum is σ = 4025204820. Its totient is φ = 464547840.

The previous prime is 1393661923. The next prime is 1393661957. The reversal of 1393661952 is 2591663931.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 1393661898 and 1393661907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393661957) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19374 + ... + 56237.

Almost surely, 2^1393661952 is an apocalyptic number.

1393661952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1393661952 is an abundant number, since it is smaller than the sum of its proper divisors (2631542868).

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

1393661952 is an equidigital number, since it uses as much as digits as its factorization.

1393661952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75639 (or 75616 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 1393661952 is about 37331.7820630090. The cubic root of 1393661952 is about 1116.9982204405.

The spelling of 1393661952 in words is "one billion, three hundred ninety-three million, six hundred sixty-one thousand, nine hundred fifty-two".