7138906 has 4 divisors (see below), whose sum is σ = 10708362. Its totient is φ = 3569452.

The previous prime is 7138883. The next prime is 7138919. The reversal of 7138906 is 6098317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6098317 = 397 ⋅15361.

It can be written as a sum of positive squares in only one way, i.e., 6974881 + 164025 = 2641^2 + 405^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1784725 + ... + 1784728.

Almost surely, 2^7138906 is an apocalyptic number.

7138906 is a deficient number, since it is larger than the sum of its proper divisors (3569456).

7138906 is a wasteful number, since it uses less digits than its factorization.

7138906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569455.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 7138906 is about 2671.8731257303. The cubic root of 7138906 is about 192.5501617745.

The spelling of 7138906 in words is "seven million, one hundred thirty-eight thousand, nine hundred six".