1242105406 has 8 divisors (see below), whose sum is σ = 1894737240. Its totient is φ = 610526328.

The previous prime is 1242105301. The next prime is 1242105407. The reversal of 1242105406 is 6045012421.

It is a happy number.

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

It is a super-2 number, since 2×1242105406² = 3085651679228849672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242105407) 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, 5263041 + ... + 5263276.

It is an arithmetic number, because the mean of its divisors is an integer number (236842155).

Almost surely, 2^1242105406 is an apocalyptic number.

1242105406 is a deficient number, since it is larger than the sum of its proper divisors (652631834).

1242105406 is a wasteful number, since it uses less digits than its factorization.

1242105406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10526378.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1242105406 is about 35243.5158007824. The cubic root of 1242105406 is about 1074.9447690391.

Adding to 1242105406 its reverse (6045012421), we get a palindrome (7287117827).

The spelling of 1242105406 in words is "one billion, two hundred forty-two million, one hundred five thousand, four hundred six".