1275026390 has 32 divisors (see below), whose sum is σ = 2612549376. Its totient is φ = 443486560.

The previous prime is 1275026381. The next prime is 1275026399. The reversal of 1275026390 is 936205721.

It is an interprime number because it is at equal distance from previous prime (1275026381) and next prime (1275026399).

It is a self number, because there is not a number n which added to its sum of digits gives 1275026390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275026399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249452 + ... + 254511.

It is an arithmetic number, because the mean of its divisors is an integer number (81642168).

Almost surely, 2^1275026390 is an apocalyptic number.

1275026390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1275026390 is an abundant number, since it is smaller than the sum of its proper divisors (1337522986).

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

1275026390 is a wasteful number, since it uses less digits than its factorization.

1275026390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504004.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 1275026390 is about 35707.5116747163. The cubic root of 1275026390 is about 1084.3589238897.

The spelling of 1275026390 in words is "one billion, two hundred seventy-five million, twenty-six thousand, three hundred ninety".