138646402 has 4 divisors (see below), whose sum is σ = 207969606. Its totient is φ = 69323200.

The previous prime is 138646399. The next prime is 138646411. The reversal of 138646402 is 204646831.

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

It can be written as a sum of positive squares in only one way, i.e., 72403081 + 66243321 = 8509^2 + 8139^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34661599 + ... + 34661602.

Almost surely, 2^138646402 is an apocalyptic number.

138646402 is a deficient number, since it is larger than the sum of its proper divisors (69323204).

138646402 is an equidigital number, since it uses as much as digits as its factorization.

138646402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69323203.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 138646402 is about 11774.8206780401. The cubic root of 138646402 is about 517.5705235012.

The spelling of 138646402 in words is "one hundred thirty-eight million, six hundred forty-six thousand, four hundred two".