145720454 has 16 divisors (see below), whose sum is σ = 238800960. Its totient is φ = 66139560.

The previous prime is 145720427. The next prime is 145720457. The reversal of 145720454 is 454027541.

It is a super-2 number, since 2×145720454² = 42468901427932232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145720454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145720457) 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, 11777 + ... + 20739.

It is an arithmetic number, because the mean of its divisors is an integer number (14925060).

Almost surely, 2^145720454 is an apocalyptic number.

145720454 is a deficient number, since it is larger than the sum of its proper divisors (93080506).

145720454 is a wasteful number, since it uses less digits than its factorization.

145720454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9715.

The product of its (nonzero) digits is 22400, while the sum is 32.

The square root of 145720454 is about 12071.4727353376. The cubic root of 145720454 is about 526.2274578052.

Adding to 145720454 its reverse (454027541), we get a palindrome (599747995).

The spelling of 145720454 in words is "one hundred forty-five million, seven hundred twenty thousand, four hundred fifty-four".