1290212740 has 24 divisors (see below), whose sum is σ = 2710333080. Its totient is φ = 515916288.

The previous prime is 1290212717. The next prime is 1290212747. The reversal of 1290212740 is 472120921.

It can be written as a sum of positive squares in 4 ways, for example, as 3268864 + 1286943876 = 1808^2 + 35874^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1290212699 and 1290212708.

It is not an unprimeable number, because it can be changed into a prime (1290212747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65484 + ... + 82876.

It is an arithmetic number, because the mean of its divisors is an integer number (112930545).

Almost surely, 2^1290212740 is an apocalyptic number.

1290212740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1290212740 is an abundant number, since it is smaller than the sum of its proper divisors (1420120340).

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

1290212740 is a wasteful number, since it uses less digits than its factorization.

1290212740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21111 (or 21109 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1290212740 is about 35919.5314557415. The cubic root of 1290212740 is about 1088.6470715197.

The spelling of 1290212740 in words is "one billion, two hundred ninety million, two hundred twelve thousand, seven hundred forty".