138453394 has 4 divisors (see below), whose sum is σ = 207680094. Its totient is φ = 69226696.

The previous prime is 138453391. The next prime is 138453397. The reversal of 138453394 is 493354831.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (138453391) and next prime (138453397).

It can be written as a sum of positive squares in only one way, i.e., 137945025 + 508369 = 11745^2 + 713^2 .

It is not an unprimeable number, because it can be changed into a prime (138453391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34613347 + ... + 34613350.

Almost surely, 2^138453394 is an apocalyptic number.

138453394 is a deficient number, since it is larger than the sum of its proper divisors (69226700).

138453394 is an equidigital number, since it uses as much as digits as its factorization.

138453394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69226699.

The product of its digits is 155520, while the sum is 40.

The square root of 138453394 is about 11766.6220301325. The cubic root of 138453394 is about 517.3302440556.

The spelling of 138453394 in words is "one hundred thirty-eight million, four hundred fifty-three thousand, three hundred ninety-four".