1397813652 has 96 divisors (see below), whose sum is σ = 3715891200. Its totient is φ = 454201056.

The previous prime is 1397813647. The next prime is 1397813701. The reversal of 1397813652 is 2563187931.

It is a junction number, because it is equal to n+sod(n) for n = 1397813598 and 1397813607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1943749 + ... + 1944467.

It is an arithmetic number, because the mean of its divisors is an integer number (38707200).

Almost surely, 2^1397813652 is an apocalyptic number.

1397813652 is a gapful number since it is divisible by the number (12) 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 1397813652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1857945600).

1397813652 is an abundant number, since it is smaller than the sum of its proper divisors (2318077548).

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

1397813652 is a wasteful number, since it uses less digits than its factorization.

1397813652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162 (or 1154 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1397813652 is about 37387.3461481288. The cubic root of 1397813652 is about 1118.1062950236.

The spelling of 1397813652 in words is "one billion, three hundred ninety-seven million, eight hundred thirteen thousand, six hundred fifty-two".