1290674645 has 8 divisors (see below), whose sum is σ = 1667948856. Its totient is φ = 953113536.

The previous prime is 1290674641. The next prime is 1290674699. The reversal of 1290674645 is 5464760921.

It can be written as a sum of positive squares in 4 ways, for example, as 4519876 + 1286154769 = 2126^2 + 35863^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1290674645 - 2² = 1290674641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1290674596 and 1290674605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290674641) 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, 9928202 + ... + 9928331.

It is an arithmetic number, because the mean of its divisors is an integer number (208493607).

Almost surely, 2^1290674645 is an apocalyptic number.

It is an amenable number.

1290674645 is a deficient number, since it is larger than the sum of its proper divisors (377274211).

1290674645 is a wasteful number, since it uses less digits than its factorization.

1290674645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19856551.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 1290674645 is about 35925.9605995442. The cubic root of 1290674645 is about 1088.7769703893.

The spelling of 1290674645 in words is "one billion, two hundred ninety million, six hundred seventy-four thousand, six hundred forty-five".