1397371550 has 24 divisors (see below), whose sum is σ = 2601476352. Its totient is φ = 558440000.

The previous prime is 1397371543. The next prime is 1397371561. The reversal of 1397371550 is 551737931.

It is a junction number, because it is equal to n+sod(n) for n = 1397371498 and 1397371507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45410 + ... + 69690.

It is an arithmetic number, because the mean of its divisors is an integer number (108394848).

Almost surely, 2^1397371550 is an apocalyptic number.

1397371550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1397371550 is a deficient number, since it is larger than the sum of its proper divisors (1204104802).

1397371550 is a wasteful number, since it uses less digits than its factorization.

1397371550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25444 (or 25439 counting only the distinct ones).

The product of its (nonzero) digits is 99225, while the sum is 41.

The square root of 1397371550 is about 37381.4332256001. The cubic root of 1397371550 is about 1117.9884039747.

The spelling of 1397371550 in words is "one billion, three hundred ninety-seven million, three hundred seventy-one thousand, five hundred fifty".