154397640 has 32 divisors (see below), whose sum is σ = 463193280. Its totient is φ = 41172672.

The previous prime is 154397627. The next prime is 154397647. The reversal of 154397640 is 46793451.

154397640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (154397647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643204 + ... + 643443.

It is an arithmetic number, because the mean of its divisors is an integer number (14474790).

Almost surely, 2^154397640 is an apocalyptic number.

154397640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

154397640 is an abundant number, since it is smaller than the sum of its proper divisors (308795640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

154397640 is a wasteful number, since it uses less digits than its factorization.

154397640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286661 (or 1286657 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 154397640 is about 12425.6846893843. The cubic root of 154397640 is about 536.4717851790.

The spelling of 154397640 in words is "one hundred fifty-four million, three hundred ninety-seven thousand, six hundred forty".