1290138154 has 8 divisors (see below), whose sum is σ = 1947080160. Its totient is φ = 641111436.

The previous prime is 1290138151. The next prime is 1290138193. The reversal of 1290138154 is 4518310921.

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

It is not an unprimeable number, because it can be changed into a prime (1290138151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978414 + ... + 1979065.

It is an arithmetic number, because the mean of its divisors is an integer number (243385020).

Almost surely, 2^1290138154 is an apocalyptic number.

1290138154 is a deficient number, since it is larger than the sum of its proper divisors (656942006).

1290138154 is a wasteful number, since it uses less digits than its factorization.

1290138154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957644.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1290138154 is about 35918.4932033625. The cubic root of 1290138154 is about 1088.6260932235.

The spelling of 1290138154 in words is "one billion, two hundred ninety million, one hundred thirty-eight thousand, one hundred fifty-four".