1438340737 has 4 divisors (see below), whose sum is σ = 1438416640. Its totient is φ = 1438264836.

The previous prime is 1438340723. The next prime is 1438340747. The reversal of 1438340737 is 7370438341.

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.

It is a cyclic number.

It is not a de Polignac number, because 1438340737 - 2²³ = 1429952129 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 1438340737.

It is not an unprimeable number, because it can be changed into a prime (1438340707) 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, 16888 + ... + 56230.

It is an arithmetic number, because the mean of its divisors is an integer number (359604160).

Almost surely, 2^1438340737 is an apocalyptic number.

It is an amenable number.

1438340737 is a deficient number, since it is larger than the sum of its proper divisors (75903).

1438340737 is an equidigital number, since it uses as much as digits as its factorization.

1438340737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75902.

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 1438340737 is about 37925.4629108202. The cubic root of 1438340737 is about 1128.8093384420.

The spelling of 1438340737 in words is "one billion, four hundred thirty-eight million, three hundred forty thousand, seven hundred thirty-seven".