1275111640 has 32 divisors (see below), whose sum is σ = 3129820560. Its totient is φ = 463676800.

The previous prime is 1275111619. The next prime is 1275111661. The reversal of 1275111640 is 461115721.

It is an interprime number because it is at equal distance from previous prime (1275111619) and next prime (1275111661).

It is a junction number, because it is equal to n+sod(n) for n = 1275111599 and 1275111608.

It is a congruent number.

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, 1448551 + ... + 1449430.

Almost surely, 2^1275111640 is an apocalyptic number.

1275111640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275111640 is an abundant number, since it is smaller than the sum of its proper divisors (1854708920).

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

1275111640 is a wasteful number, since it uses less digits than its factorization.

1275111640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898003 (or 2897999 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 1275111640 is about 35708.7053811812. The cubic root of 1275111640 is about 1084.3830905890.

The spelling of 1275111640 in words is "one billion, two hundred seventy-five million, one hundred eleven thousand, six hundred forty".