1397487933 has 6 divisors (see below), whose sum is σ = 2018593694. Its totient is φ = 931658616.

The previous prime is 1397487913. The next prime is 1397487947. The reversal of 1397487933 is 3397847931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1371813444 + 25674489 = 37038^2 + 5067^2 .

It is not a de Polignac number, because 1397487933 - 2⁶ = 1397487869 is a prime.

It is a super-2 number, since 2×1397487933² = 3905945045761224978, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1397487933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397487913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77638210 + ... + 77638227.

Almost surely, 2^1397487933 is an apocalyptic number.

It is an amenable number.

1397487933 is a deficient number, since it is larger than the sum of its proper divisors (621105761).

1397487933 is a wasteful number, since it uses less digits than its factorization.

1397487933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155276443 (or 155276440 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 1397487933 is about 37382.9898884506. The cubic root of 1397487933 is about 1118.0194411106.

The spelling of 1397487933 in words is "one billion, three hundred ninety-seven million, four hundred eighty-seven thousand, nine hundred thirty-three".