145402421 has 8 divisors (see below), whose sum is σ = 153784800. Its totient is φ = 137093040.

The previous prime is 145402417. The next prime is 145402447. The reversal of 145402421 is 124204541.

145402421 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

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 145402421 - 2² = 145402417 is a prime.

It is a super-2 number, since 2×145402421² = 42283728065322482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145402721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14126 + ... + 22143.

It is an arithmetic number, because the mean of its divisors is an integer number (19223100).

Almost surely, 2^145402421 is an apocalyptic number.

It is an amenable number.

145402421 is a deficient number, since it is larger than the sum of its proper divisors (8382379).

145402421 is a wasteful number, since it uses less digits than its factorization.

145402421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36499.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 145402421 is about 12058.2926237507. The cubic root of 145402421 is about 525.8443507617.

Adding to 145402421 its reverse (124204541), we get a palindrome (269606962).

It can be divided in two parts, 14540 and 2421, that added together give a palindrome (16961).

The spelling of 145402421 in words is "one hundred forty-five million, four hundred two thousand, four hundred twenty-one".