1277140945 has 8 divisors (see below), whose sum is σ = 1582007040. Its totient is φ = 988754160.

The previous prime is 1277140927. The next prime is 1277141009. The reversal of 1277140945 is 5490417721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1277140945 - 2¹⁹ = 1276616657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1277140898 and 1277140907.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4119655 + ... + 4119964.

It is an arithmetic number, because the mean of its divisors is an integer number (197750880).

Almost surely, 2^1277140945 is an apocalyptic number.

It is an amenable number.

1277140945 is a deficient number, since it is larger than the sum of its proper divisors (304866095).

1277140945 is an equidigital number, since it uses as much as digits as its factorization.

1277140945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8239655.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 1277140945 is about 35737.1087946409. The cubic root of 1277140945 is about 1084.9580409493.

The spelling of 1277140945 in words is "one billion, two hundred seventy-seven million, one hundred forty thousand, nine hundred forty-five".