1345690237 has 4 divisors (see below), whose sum is σ = 1345777696. Its totient is φ = 1345602780.

The previous prime is 1345690223. The next prime is 1345690271. The reversal of 1345690237 is 7320965431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7320965431 = 13 ⋅563151187.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1345690237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1345690237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345690207) 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, 13839 + ... + 53692.

It is an arithmetic number, because the mean of its divisors is an integer number (336444424).

Almost surely, 2^1345690237 is an apocalyptic number.

It is an amenable number.

1345690237 is a deficient number, since it is larger than the sum of its proper divisors (87459).

1345690237 is an equidigital number, since it uses as much as digits as its factorization.

1345690237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87458.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 1345690237 is about 36683.6508134073. The cubic root of 1345690237 is about 1104.0320993454.

The spelling of 1345690237 in words is "one billion, three hundred forty-five million, six hundred ninety thousand, two hundred thirty-seven".