1397027540 has 12 divisors (see below), whose sum is σ = 2933757876. Its totient is φ = 558811008.

The previous prime is 1397027539. The next prime is 1397027543. The reversal of 1397027540 is 457207931.

It can be written as a sum of positive squares in 2 ways, for example, as 324072004 + 1072955536 = 18002^2 + 32756^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1397027494 and 1397027503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397027543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34925669 + ... + 34925708.

It is an arithmetic number, because the mean of its divisors is an integer number (244479823).

Almost surely, 2^1397027540 is an apocalyptic number.

1397027540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1397027540 is an abundant number, since it is smaller than the sum of its proper divisors (1536730336).

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

1397027540 is a wasteful number, since it uses less digits than its factorization.

1397027540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69851386 (or 69851384 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 1397027540 is about 37376.8315939166. The cubic root of 1397027540 is about 1117.8966529641.

The spelling of 1397027540 in words is "one billion, three hundred ninety-seven million, twenty-seven thousand, five hundred forty".