154378639 has 2 divisors, whose sum is σ = 154378640. Its totient is φ = 154378638.

The previous prime is 154378613. The next prime is 154378657. The reversal of 154378639 is 936873451.

154378639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 154378639 - 2⁵ = 154378607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154378699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77189319 + 77189320.

It is an arithmetic number, because the mean of its divisors is an integer number (77189320).

Almost surely, 2^154378639 is an apocalyptic number.

154378639 is a deficient number, since it is larger than the sum of its proper divisors (1).

154378639 is an equidigital number, since it uses as much as digits as its factorization.

154378639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 46.

The square root of 154378639 is about 12424.9200802259. The cubic root of 154378639 is about 536.4497772463.

The spelling of 154378639 in words is "one hundred fifty-four million, three hundred seventy-eight thousand, six hundred thirty-nine".