1240002154 has 4 divisors (see below), whose sum is σ = 1860003234. Its totient is φ = 620001076.

The previous prime is 1240002133. The next prime is 1240002161. The reversal of 1240002154 is 4512000421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4512000421 = 281 ⋅16056941.

It can be written as a sum of positive squares in only one way, i.e., 656538129 + 583464025 = 25623^2 + 24155^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310000537 + ... + 310000540.

Almost surely, 2^1240002154 is an apocalyptic number.

1240002154 is a deficient number, since it is larger than the sum of its proper divisors (620001080).

1240002154 is an equidigital number, since it uses as much as digits as its factorization.

1240002154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620001079.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1240002154 is about 35213.6643080495. The cubic root of 1240002154 is about 1074.3376930644.

Adding to 1240002154 its reverse (4512000421), we get a palindrome (5752002575).

The spelling of 1240002154 in words is "one billion, two hundred forty million, two thousand, one hundred fifty-four".