1290187923380 has 18 divisors (see below), whose sum is σ = 2709405306594. Its totient is φ = 516073137456.

The previous prime is 1290187923331. The next prime is 1290187923383. The reversal of 1290187923380 is 833297810921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1032150338704 + 258037584676 = 1015948^2 + 507974^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290187923383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4952747 + ... + 5206733.

It is an arithmetic number, because the mean of its divisors is an integer number (150522517033).

Almost surely, 2^{1290187923380} is an apocalyptic number.

1290187923380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1290187923380 is an abundant number, since it is smaller than the sum of its proper divisors (1419217383214).

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

1290187923380 is an frugal number, since it uses more digits than its factorization.

1290187923380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507983 (or 253994 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 1290187923380 in words is "one trillion, two hundred ninety billion, one hundred eighty-seven million, nine hundred twenty-three thousand, three hundred eighty".