1377640505 has 32 divisors (see below), whose sum is σ = 1818374400. Its totient is φ = 997920000.

The previous prime is 1377640489. The next prime is 1377640507. The reversal of 1377640505 is 5050467731.

It is not a de Polignac number, because 1377640505 - 2⁴ = 1377640489 is a prime.

It is a super-2 number, since 2×1377640505² = 3795786722033310050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1377640507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275780 + ... + 280730.

It is an arithmetic number, because the mean of its divisors is an integer number (56824200).

Almost surely, 2^1377640505 is an apocalyptic number.

It is an amenable number.

1377640505 is a deficient number, since it is larger than the sum of its proper divisors (440733895).

1377640505 is a wasteful number, since it uses less digits than its factorization.

1377640505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 1377640505 is about 37116.5799205692. The cubic root of 1377640505 is about 1112.7013998883.

The spelling of 1377640505 in words is "one billion, three hundred seventy-seven million, six hundred forty thousand, five hundred five".