1377191745 has 24 divisors (see below), whose sum is σ = 2442650496. Its totient is φ = 717419808.

The previous prime is 1377191731. The next prime is 1377191749. The reversal of 1377191745 is 5471917731.

It is not a de Polignac number, because 1377191745 - 2⁵ = 1377191713 is a prime.

It is a super-2 number, since 2×1377191745² = 3793314204992290050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1377191745.

It is not an unprimeable number, because it can be changed into a prime (1377191749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 353929 + ... + 357798.

It is an arithmetic number, because the mean of its divisors is an integer number (101777104).

Almost surely, 2^1377191745 is an apocalyptic number.

1377191745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1377191745 is a deficient number, since it is larger than the sum of its proper divisors (1065458751).

1377191745 is a wasteful number, since it uses less digits than its factorization.

1377191745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711781 (or 711778 counting only the distinct ones).

The product of its digits is 185220, while the sum is 45.

The square root of 1377191745 is about 37110.5341513700. The cubic root of 1377191745 is about 1112.5805676617.

The spelling of 1377191745 in words is "one billion, three hundred seventy-seven million, one hundred ninety-one thousand, seven hundred forty-five".