1377391668 has 12 divisors (see below), whose sum is σ = 3213913920. Its totient is φ = 459130552.

The previous prime is 1377391661. The next prime is 1377391703. The reversal of 1377391668 is 8661937731.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1377391668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377391661) 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, 57391308 + ... + 57391331.

It is an arithmetic number, because the mean of its divisors is an integer number (267826160).

Almost surely, 2^1377391668 is an apocalyptic number.

It is an amenable number.

1377391668 is an abundant number, since it is smaller than the sum of its proper divisors (1836522252).

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

1377391668 is a wasteful number, since it uses less digits than its factorization.

1377391668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114782646 (or 114782644 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 51.

The square root of 1377391668 is about 37113.2276688514. The cubic root of 1377391668 is about 1112.6344017734.

The spelling of 1377391668 in words is "one billion, three hundred seventy-seven million, three hundred ninety-one thousand, six hundred sixty-eight".