1242400037 has 4 divisors (see below), whose sum is σ = 1247732460. Its totient is φ = 1237067616.

The previous prime is 1242400009. The next prime is 1242400043. The reversal of 1242400037 is 7300042421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124233316 + 1118166721 = 11146^2 + 33439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242400037 - 2¹⁰ = 1242399013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242399985 and 1242400021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242400087) 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, 2665862 + ... + 2666327.

It is an arithmetic number, because the mean of its divisors is an integer number (311933115).

Almost surely, 2^1242400037 is an apocalyptic number.

It is an amenable number.

1242400037 is a deficient number, since it is larger than the sum of its proper divisors (5332423).

1242400037 is an equidigital number, since it uses as much as digits as its factorization.

1242400037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332422.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 1242400037 is about 35247.6954849533. The cubic root of 1242400037 is about 1075.0297556573.

Adding to 1242400037 its reverse (7300042421), we get a palindrome (8542442458).

The spelling of 1242400037 in words is "one billion, two hundred forty-two million, four hundred thousand, thirty-seven".