145904421 has 32 divisors (see below), whose sum is σ = 222808320. Its totient is φ = 84132864.

The previous prime is 145904419. The next prime is 145904441. The reversal of 145904421 is 124409541.

It is not a de Polignac number, because 145904421 - 2¹ = 145904419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145904411) 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, 237711 + ... + 238323.

It is an arithmetic number, because the mean of its divisors is an integer number (6962760).

Almost surely, 2^145904421 is an apocalyptic number.

It is an amenable number.

145904421 is a deficient number, since it is larger than the sum of its proper divisors (76903899).

145904421 is a wasteful number, since it uses less digits than its factorization.

145904421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 145904421 is about 12079.0902389211. The cubic root of 145904421 is about 526.4488126288.

The spelling of 145904421 in words is "one hundred forty-five million, nine hundred four thousand, four hundred twenty-one".