1375666400 has 36 divisors (see below), whose sum is σ = 3358347552. Its totient is φ = 550266240.

The previous prime is 1375666379. The next prime is 1375666423. The reversal of 1375666400 is 46665731.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 858992 + ... + 860591.

It is an arithmetic number, because the mean of its divisors is an integer number (93287432).

Almost surely, 2^1375666400 is an apocalyptic number.

1375666400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1375666400 is an abundant number, since it is smaller than the sum of its proper divisors (1982681152).

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

1375666400 is a wasteful number, since it uses less digits than its factorization.

1375666400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719603 (or 1719590 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 1375666400 is about 37089.9770827646. The cubic root of 1375666400 is about 1112.1696599474.

The spelling of 1375666400 in words is "one billion, three hundred seventy-five million, six hundred sixty-six thousand, four hundred".