145391457 has 32 divisors (see below), whose sum is σ = 205922304. Its totient is φ = 91123200.

The previous prime is 145391437. The next prime is 145391459. The reversal of 145391457 is 754193541.

It is not a de Polignac number, because 145391457 - 2⁷ = 145391329 is a prime.

It is a super-2 number, since 2×145391457² = 42277351537165698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145391459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 640378 + ... + 640604.

It is an arithmetic number, because the mean of its divisors is an integer number (6435072).

Almost surely, 2^145391457 is an apocalyptic number.

It is an amenable number.

145391457 is a deficient number, since it is larger than the sum of its proper divisors (60530847).

145391457 is a wasteful number, since it uses less digits than its factorization.

145391457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429.

The product of its digits is 75600, while the sum is 39.

The square root of 145391457 is about 12057.8379902867. The cubic root of 145391457 is about 525.8311334156.

The spelling of 145391457 in words is "one hundred forty-five million, three hundred ninety-one thousand, four hundred fifty-seven".