1138402 has 4 divisors (see below), whose sum is σ = 1707606. Its totient is φ = 569200.

The previous prime is 1138393. The next prime is 1138409. The reversal of 1138402 is 2048311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2048311 = 23 ⋅89057.

It can be written as a sum of positive squares in only one way, i.e., 1022121 + 116281 = 1011^2 + 341^2 .

It is a super-2 number, since 2×1138402² = 2591918227208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1138402.

It is not an unprimeable number, because it can be changed into a prime (1138409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 284599 + ... + 284602.

2^1138402 is an apocalyptic number.

1138402 is a deficient number, since it is larger than the sum of its proper divisors (569204).

1138402 is an equidigital number, since it uses as much as digits as its factorization.

1138402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569203.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1138402 is about 1066.9592307113. The cubic root of 1138402 is about 104.4155587172.

Subtracting 1138402 from its reverse (2048311), we obtain a palindrome (909909).

It can be divided in two parts, 1138 and 402, that added together give a triangular number (1540 = T₅₅).

The spelling of 1138402 in words is "one million, one hundred thirty-eight thousand, four hundred two".