145389457 has 8 divisors (see below), whose sum is σ = 154091592. Its totient is φ = 136704000.

The previous prime is 145389449. The next prime is 145389479. The reversal of 145389457 is 754983541.

145389457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3207681 + 142181776 = 1791^2 + 11924^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145389457 - 2³ = 145389449 is a prime.

It is a super-2 number, since 2×145389457² = 42276188413509698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145389427) 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, 16857 + ... + 23977.

It is an arithmetic number, because the mean of its divisors is an integer number (19261449).

Almost surely, 2^145389457 is an apocalyptic number.

145389457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

145389457 is a deficient number, since it is larger than the sum of its proper divisors (8702135).

145389457 is a wasteful number, since it uses less digits than its factorization.

145389457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8339.

The product of its digits is 604800, while the sum is 46.

The square root of 145389457 is about 12057.7550563942. The cubic root of 145389457 is about 525.8287222994.

The spelling of 145389457 in words is "one hundred forty-five million, three hundred eighty-nine thousand, four hundred fifty-seven".